[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ module_id=”personnel” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Research staff<\/h3>\n
[\/et_pb_text][et_pb_code _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]
![\"BRAHAM](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/09\/picto-portrait-1536x1536.jpg\")
<\/a><\/figure><\/div>BRAHAM Prahalad Kanti<\/a><\/span><\/h3>Postdoctoral Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
![\"MAUDE](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/09\/Ducan_MAUDE.jpg\")
<\/a><\/figure><\/div>MAUDE Duncan<\/a><\/span><\/h3>Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
![\"PLOCHOCKA](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/02\/plochocka.png\")
<\/a><\/figure><\/div>PLOCHOCKA Paulina<\/a><\/span><\/h3>Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
<\/a><\/figure><\/div>POSMYK Katarzyna<\/a><\/span><\/h3>PhD Student<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
![\"Default](\"https:\/\/lncmi.cnrs.fr\/wp-content\/plugins\/tlp-team\/assets\/images\/demo.jpg\")
<\/a><\/figure><\/div>RYGALA Michal<\/a><\/span><\/h3>Postdoctoral Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” admin_label=”Actus” module_id=”actualites” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_fullwidth_post_slider posts_number=”5″ include_categories=”4227,4321″ excerpt_length=”100″ show_meta=”off” use_text_overlay=”off” _builder_version=”4.27.0″ _module_preset=”default” header_font=”|700|on||||||” header_text_align=”left” body_font=”–et_global_body_font||||||||” body_text_align=”left” body_line_height=”1.4em” background_color=”#FFFFFF” custom_button=”on” button_border_radius=”100px” button_font=”Verdana||||||||” button_alignment=”left” width=”70%” module_alignment=”center” content_width=”100%” height=”300px” height_tablet=”300px” height_phone=”350px” height_last_edited=”on|phone” max_height=”300px” max_height_tablet=”300px” max_height_phone=”350px” max_height_last_edited=”on|desktop” custom_margin=”25px|25px|25px|25px|true|true” custom_padding=”60px||74px||false|false” auto=”on” auto_speed=”10000″ hover_transition_duration=”500ms” hover_transition_speed_curve=”ease-in” body_font_size_tablet=”” body_font_size_phone=”15px” body_font_size_last_edited=”on|phone” button_text_size_tablet=”17px” button_text_size_phone=”14px” button_text_size_last_edited=”on|tablet” custom_css_free_form=”.et_pb_more_button:hover{|| -webkit-backdrop-filter: blur(5px);|| backdrop-filter: blur(5px);|| border: solid 2px rgba(255,255,255,0.2) !IMPORTANT;|| transition: backdrop-filter ease-in-out 0.2s;||}” header_text_shadow_style=”preset1″ header_text_shadow_blur_strength=”1em” border_radii=”on|25px|25px|25px|25px” border_color_all=”#FFFFFF” button_text_shadow_style=”preset1″ button_text_shadow_blur_strength=”1em” box_shadow_style=”preset3″ box_shadow_blur=”23px” box_shadow_spread=”-30px” box_shadow_style_button=”preset1″ global_colors_info=”{}” box_shadow_blur__hover_enabled=”on|desktop” box_shadow_vertical__hover_enabled=”on|hover” box_shadow_vertical__hover=”10px” box_shadow_blur__hover=”25px” box_shadow_spread__hover=”-10px” box_shadow_spread__hover_enabled=”on|hover”][\/et_pb_fullwidth_post_slider][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”https:\/\/lncmi.cnrs.fr\/category\/spectroscopies-pour-lelectronique-quantique” button_text=”See all articles” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”16px” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Th\u00e8mes de recherche” module_id=”themes” _builder_version=”4.27.0″ _module_preset=”default” background_color=”rgba(0,0,0,0.02)” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Topics<\/h3>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_4,3_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/09\/Duncan1.png” title_text=”Duncan1″ _builder_version=”4.27.0″ _module_preset=”default” width=”300px” height=”223px” custom_margin=”||-22px|||” custom_padding=”|19px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”3_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.0″ _module_preset=”default” width=”98.6%” global_colors_info=”{}”]<\/p>\n
GaAs nanowires<\/h1>\n
Single GaAs\/AlAs nanowire in magnetic field<\/p>\n
It is now possible to grow using molecular beam epitaxy (MBE) defect free GaAs\/AlAs core\/shell nanowires (NWs) with optical properties approaching those of the best optical quality MBE grown GaAs. In contrast to 3D GaAs, core\/shell NWs give bright emission at room temperature opening the way for numerous optoelectronic applications. Furthermore, the NWs can be grown with GaAs in the zinc-blende or wurzite phase, the latter phase being unique to NWs.<\/p>\n
Magnetic field, which couples to both the orbital and the spin degree of freedom, can be used to investigate the fascinating physics of confined one dimensional excitons. The diamagnetic shift gives information on the extent of the exciton wave function and the associated orbital quantum number. Alternatively, the coupling to the spin degree of freedom leads to a Zeeman splitting of the exciton lines at high field giving information concerning the electron and hole g-factors and many body interactions.<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Fig.1 Typical emission spectra from single GaAs\/AlAs nanowire together with the magnetic field evolution of the emission. The colour plot shows differential \u03bcPL spectra to highlight the evolution of the emission as a function of magnetic field at T = 1.7 K. Several sharp emission lines are resolved which exhibit a large diamagnetic shift and Zeeman splitting at high magnetic fields.<\/p>\n
For more details please see Plochocka et al. Nano Letters, 13, 2442, (2013)<\/a> and Jadczak et al. Nano Letters, 14, 2807 (2014)<\/a>.<\/p>\nMeasurements performed in high magnetic field allowed us to detect in the emission several lines associated with excitons bound to defect pairs. Such lines were previously observed in epitaxial GaAs of very high optical quality, as reported by Kunzel and Ploog. This demonstrates that the optical quality of our GaAs\/AlAs core\/shell nanowires is comparable to the best GaAs layers grown by molecular beam epitaxy. Moreover, strong free exciton emission is observed even at room temperature.<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ module_id=”techniques” _builder_version=”4.27.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text module_id=”techniques” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Techniques<\/h2>\n
[\/et_pb_text][et_pb_toggle title=”Zero field optical spectroscopy ” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
\n\n\n\n\n\nPhotoluminescence, photoluminescence excitation (PLE), absorption, transmission, reflectance, Raman scattering. Micro-photoluminescence, micro-Raman.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
[\/et_pb_toggle][et_pb_toggle title=”Magneto-optical spectroscopy” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n
\n\n\n\n\n\nMagneto-photoluminescence, magneto-transmission, mageto-reflectance in pulsed magnetic fields up to 90T.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
[\/et_pb_toggle][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Publications” module_id=”publications” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Publications<\/h3>\n
[\/et_pb_text][et_pb_toggle title=”LNCMI thematic publications on HAL” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
\n \n \n \n\n - \n \n \n\n [hal-04869404] Giant enhancement of second harmonic light intensity in waveguiding core\/shell ZnTe\/ZnMgTe nanowires<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-07\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867907] Nonradiative Energy Transfer and Selective Charge Transfer in a WS 2 \/(PEA) 2 PbI 4 Heterostructure<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867864] Tuning the Excitonic Properties of the 2D (PEA) 2 (MA) n \u22121 Pb n I 3 n +1 Perovskite Family via Quantum Confinement<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867845] Brightening of dark excitons in 2D perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867423] Thickness-Dependent Dark-Bright Exciton Splitting and Phonon Bottleneck in CsPbBr 3 -Based Nanoplatelets Revealed via Magneto-Optical Spectroscopy<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867332] Spectral Dependence of the Energy Transfer from Photosynthetic Complexes to Monolayer Graphene<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867286] Strain induced lifting of the charged exciton degeneracy in monolayer MoS 2 on a GaAs nanomembrane<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04830717] Manganese doping for enhanced magnetic brightening and circular polarization control of dark excitons in paramagnetic layered hybrid metal-halide perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2024-12-11\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04596394] Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2024-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04596394] Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2024-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04144838] Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2\/MoS2 heterostructures<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2023-06-28\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04144838] Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2\/MoS2 heterostructures<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2023-06-28\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-03923271] Quantification of Exciton Fine Structure Splitting in a Two-Dimensional Perovskite Compound<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2023-01-04\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-03923271] Quantification of Exciton Fine Structure Splitting in a Two-Dimensional Perovskite Compound<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2023-01-04\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-02462053] Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2020-01-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-02462053] Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2020-01-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-02438506] Excitonic Properties of Low-Band-Gap Lead-Tin Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2020-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-02438506] Excitonic Properties of Low-Band-Gap Lead-Tin Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2020-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-02003211] Long-lived photoluminescence polarization of localized excitons in liquid exfoliated monolayer enriched WS2<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-02-01\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01985737] NMR Probing of the Spin Polarization of the \u03bd = 5 \/ 2 Quantum Hall State<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-18\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01985737] NMR Probing of the Spin Polarization of the \u03bd = 5 \/ 2 Quantum Hall State<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-18\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980744] Impact of photodoping on inter- and intralayer exciton emission in a MoS2\/MoSe2\/MoS2 heterostructure<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980744] Impact of photodoping on inter- and intralayer exciton emission in a MoS2\/MoSe2\/MoS2 heterostructure<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980689] Intervalley Scattering of Interlayer Excitons in a MoS2\/MoSe2\/MoS2 Heterostructure in High Magnetic Field<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980689] Intervalley Scattering of Interlayer Excitons in a MoS2\/MoSe2\/MoS2 Heterostructure in High Magnetic Field<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980675] The influence of the Rashba effect<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01980675] The influence of the Rashba effect<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01939749] Static and Dynamic Disorder in Triple-Cation Hybrid Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-11-29\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01939749] Static and Dynamic Disorder in Triple-Cation Hybrid Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-11-29\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01860720] Impact of the Halide Cage on the Electronic Properties of Fully Inorganic Cesium Lead Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01860720] Impact of the Halide Cage on the Electronic Properties of Fully Inorganic Cesium Lead Halide Perovskites<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01860714] Unraveling the Exciton Binding Energy and the Dielectric Constant in Single-Crystal Methylammonium Lead Triiodide Perovskite<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01860714] Unraveling the Exciton Binding Energy and the Dielectric Constant in Single-Crystal Methylammonium Lead Triiodide Perovskite<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01804305] Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2\/MoSe2\/MoS2 Trilayer van der Waals Heterostructures<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01804305] Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2\/MoSe2\/MoS2 Trilayer van der Waals Heterostructures<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01799055] Ultrahigh magnetic eld spectroscopy reveals the band structure of the three-dimensional topological insulator Bi2Se3<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-05-24\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-01799055] Ultrahigh magnetic eld spectroscopy reveals the band structure of the three-dimensional topological insulator Bi2Se3<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2018-05-24\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n
- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
MAUDE Duncan<\/a><\/span><\/h3>
Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
PLOCHOCKA Paulina<\/a><\/span><\/h3>
Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
POSMYK Katarzyna<\/a><\/span><\/h3>
PhD Student<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
RYGALA Michal<\/a><\/span><\/h3>
Postdoctoral Researcher<\/a><\/div>- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” admin_label=”Actus” module_id=”actualites” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_fullwidth_post_slider posts_number=”5″ include_categories=”4227,4321″ excerpt_length=”100″ show_meta=”off” use_text_overlay=”off” _builder_version=”4.27.0″ _module_preset=”default” header_font=”|700|on||||||” header_text_align=”left” body_font=”–et_global_body_font||||||||” body_text_align=”left” body_line_height=”1.4em” background_color=”#FFFFFF” custom_button=”on” button_border_radius=”100px” button_font=”Verdana||||||||” button_alignment=”left” width=”70%” module_alignment=”center” content_width=”100%” height=”300px” height_tablet=”300px” height_phone=”350px” height_last_edited=”on|phone” max_height=”300px” max_height_tablet=”300px” max_height_phone=”350px” max_height_last_edited=”on|desktop” custom_margin=”25px|25px|25px|25px|true|true” custom_padding=”60px||74px||false|false” auto=”on” auto_speed=”10000″ hover_transition_duration=”500ms” hover_transition_speed_curve=”ease-in” body_font_size_tablet=”” body_font_size_phone=”15px” body_font_size_last_edited=”on|phone” button_text_size_tablet=”17px” button_text_size_phone=”14px” button_text_size_last_edited=”on|tablet” custom_css_free_form=”.et_pb_more_button:hover{|| -webkit-backdrop-filter: blur(5px);|| backdrop-filter: blur(5px);|| border: solid 2px rgba(255,255,255,0.2) !IMPORTANT;|| transition: backdrop-filter ease-in-out 0.2s;||}” header_text_shadow_style=”preset1″ header_text_shadow_blur_strength=”1em” border_radii=”on|25px|25px|25px|25px” border_color_all=”#FFFFFF” button_text_shadow_style=”preset1″ button_text_shadow_blur_strength=”1em” box_shadow_style=”preset3″ box_shadow_blur=”23px” box_shadow_spread=”-30px” box_shadow_style_button=”preset1″ global_colors_info=”{}” box_shadow_blur__hover_enabled=”on|desktop” box_shadow_vertical__hover_enabled=”on|hover” box_shadow_vertical__hover=”10px” box_shadow_blur__hover=”25px” box_shadow_spread__hover=”-10px” box_shadow_spread__hover_enabled=”on|hover”][\/et_pb_fullwidth_post_slider][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”https:\/\/lncmi.cnrs.fr\/category\/spectroscopies-pour-lelectronique-quantique” button_text=”See all articles” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”16px” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Th\u00e8mes de recherche” module_id=”themes” _builder_version=”4.27.0″ _module_preset=”default” background_color=”rgba(0,0,0,0.02)” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Topics<\/h3>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_4,3_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/09\/Duncan1.png” title_text=”Duncan1″ _builder_version=”4.27.0″ _module_preset=”default” width=”300px” height=”223px” custom_margin=”||-22px|||” custom_padding=”|19px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”3_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.0″ _module_preset=”default” width=”98.6%” global_colors_info=”{}”]<\/p>\n
GaAs nanowires<\/h1>\n
Single GaAs\/AlAs nanowire in magnetic field<\/p>\n
It is now possible to grow using molecular beam epitaxy (MBE) defect free GaAs\/AlAs core\/shell nanowires (NWs) with optical properties approaching those of the best optical quality MBE grown GaAs. In contrast to 3D GaAs, core\/shell NWs give bright emission at room temperature opening the way for numerous optoelectronic applications. Furthermore, the NWs can be grown with GaAs in the zinc-blende or wurzite phase, the latter phase being unique to NWs.<\/p>\n
Magnetic field, which couples to both the orbital and the spin degree of freedom, can be used to investigate the fascinating physics of confined one dimensional excitons. The diamagnetic shift gives information on the extent of the exciton wave function and the associated orbital quantum number. Alternatively, the coupling to the spin degree of freedom leads to a Zeeman splitting of the exciton lines at high field giving information concerning the electron and hole g-factors and many body interactions.<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Fig.1 Typical emission spectra from single GaAs\/AlAs nanowire together with the magnetic field evolution of the emission. The colour plot shows differential \u03bcPL spectra to highlight the evolution of the emission as a function of magnetic field at T = 1.7 K. Several sharp emission lines are resolved which exhibit a large diamagnetic shift and Zeeman splitting at high magnetic fields.<\/p>\n
For more details please see Plochocka et al. Nano Letters, 13, 2442, (2013)<\/a> and Jadczak et al. Nano Letters, 14, 2807 (2014)<\/a>.<\/p>\n
Measurements performed in high magnetic field allowed us to detect in the emission several lines associated with excitons bound to defect pairs. Such lines were previously observed in epitaxial GaAs of very high optical quality, as reported by Kunzel and Ploog. This demonstrates that the optical quality of our GaAs\/AlAs core\/shell nanowires is comparable to the best GaAs layers grown by molecular beam epitaxy. Moreover, strong free exciton emission is observed even at room temperature.<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ module_id=”techniques” _builder_version=”4.27.0″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text module_id=”techniques” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Techniques<\/h2>\n
[\/et_pb_text][et_pb_toggle title=”Zero field optical spectroscopy ” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
\n\n\n\n\n\nPhotoluminescence, photoluminescence excitation (PLE), absorption, transmission, reflectance, Raman scattering. Micro-photoluminescence, micro-Raman.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
[\/et_pb_toggle][et_pb_toggle title=”Magneto-optical spectroscopy” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n
\n\n\n\n\n\nMagneto-photoluminescence, magneto-transmission, mageto-reflectance in pulsed magnetic fields up to 90T.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
[\/et_pb_toggle][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Publications” module_id=”publications” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Publications<\/h3>\n
[\/et_pb_text][et_pb_toggle title=”LNCMI thematic publications on HAL” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
\n\n \n \n- \n
- \n \n \n\n [hal-04869404] Giant enhancement of second harmonic light intensity in waveguiding core\/shell ZnTe\/ZnMgTe nanowires<\/a>\n\n\n\n\n\n\n\n \n \n Published on Hal on 2025-01-07\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n
- \n \n \n\n [hal-04867907] Nonradiative Energy Transfer and Selective Charge Transfer in a WS 2 \/(PEA) 2 PbI 4 Heterostructure<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04867864] Tuning the Excitonic Properties of the 2D (PEA) 2 (MA) n \u22121 Pb n I 3 n +1 Perovskite Family via Quantum Confinement<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04867845] Brightening of dark excitons in 2D perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04867423] Thickness-Dependent Dark-Bright Exciton Splitting and Phonon Bottleneck in CsPbBr 3 -Based Nanoplatelets Revealed via Magneto-Optical Spectroscopy<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04867332] Spectral Dependence of the Energy Transfer from Photosynthetic Complexes to Monolayer Graphene<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04867286] Strain induced lifting of the charged exciton degeneracy in monolayer MoS 2 on a GaAs nanomembrane<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2025-01-06\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04830717] Manganese doping for enhanced magnetic brightening and circular polarization control of dark excitons in paramagnetic layered hybrid metal-halide perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2024-12-11\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04596394] Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2024-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04596394] Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2024-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04144838] Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2\/MoS2 heterostructures<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2023-06-28\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-04144838] Twist-angle dependent dehybridization of momentum-indirect excitons in MoSe2\/MoS2 heterostructures<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2023-06-28\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-03923271] Quantification of Exciton Fine Structure Splitting in a Two-Dimensional Perovskite Compound<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2023-01-04\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-03923271] Quantification of Exciton Fine Structure Splitting in a Two-Dimensional Perovskite Compound<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2023-01-04\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-02462053] Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2020-01-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-02462053] Revealing the nature of photoluminescence emission in the metal-halide double perovskite Cs2AgBiBr6<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2020-01-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-02438506] Excitonic Properties of Low-Band-Gap Lead-Tin Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2020-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-02438506] Excitonic Properties of Low-Band-Gap Lead-Tin Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2020-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-02003211] Long-lived photoluminescence polarization of localized excitons in liquid exfoliated monolayer enriched WS2<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-02-01\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01985737] NMR Probing of the Spin Polarization of the \u03bd = 5 \/ 2 Quantum Hall State<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-18\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01985737] NMR Probing of the Spin Polarization of the \u03bd = 5 \/ 2 Quantum Hall State<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-18\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980744] Impact of photodoping on inter- and intralayer exciton emission in a MoS2\/MoSe2\/MoS2 heterostructure<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980744] Impact of photodoping on inter- and intralayer exciton emission in a MoS2\/MoSe2\/MoS2 heterostructure<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980689] Intervalley Scattering of Interlayer Excitons in a MoS2\/MoSe2\/MoS2 Heterostructure in High Magnetic Field<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980689] Intervalley Scattering of Interlayer Excitons in a MoS2\/MoSe2\/MoS2 Heterostructure in High Magnetic Field<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980675] The influence of the Rashba effect<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01980675] The influence of the Rashba effect<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2019-01-14\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01939749] Static and Dynamic Disorder in Triple-Cation Hybrid Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-11-29\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01939749] Static and Dynamic Disorder in Triple-Cation Hybrid Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-11-29\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01860720] Impact of the Halide Cage on the Electronic Properties of Fully Inorganic Cesium Lead Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01860720] Impact of the Halide Cage on the Electronic Properties of Fully Inorganic Cesium Lead Halide Perovskites<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01860714] Unraveling the Exciton Binding Energy and the Dielectric Constant in Single-Crystal Methylammonium Lead Triiodide Perovskite<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01860714] Unraveling the Exciton Binding Energy and the Dielectric Constant in Single-Crystal Methylammonium Lead Triiodide Perovskite<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-08-23\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01804305] Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2\/MoSe2\/MoS2 Trilayer van der Waals Heterostructures<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01804305] Defect Healing and Charge Transfer-Mediated Valley Polarization in MoS2\/MoSe2\/MoS2 Trilayer van der Waals Heterostructures<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-05-31\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01799055] Ultrahigh magnetic eld spectroscopy reveals the band structure of the three-dimensional topological insulator Bi2Se3<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-05-24\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n [hal-01799055] Ultrahigh magnetic eld spectroscopy reveals the band structure of the three-dimensional topological insulator Bi2Se3<\/a>\n\n\n\n\n\n\n
\n \n \n Published on Hal on 2018-05-24\n <\/span>\n \n <\/div>\n\n\n\n\n\n \n <\/li>\n- \n \n \n\n
- \n \n \n\n [hal-04867907] Nonradiative Energy Transfer and Selective Charge Transfer in a WS 2 \/(PEA) 2 PbI 4 Heterostructure<\/a>\n\n\n\n\n\n\n
- \n \n \n\n [hal-04869404] Giant enhancement of second harmonic light intensity in waveguiding core\/shell ZnTe\/ZnMgTe nanowires<\/a>\n\n\n\n\n\n\n
- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
- <\/i>Toulouse<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>