Dirac matter

The fabrication and subsequent experiments on graphene created unexpected links between solid-state physics and quantum electrodynamics and triggered an intensive search for other condensed-matter systems with similarly structured electronic bands. At present, a number of such materials has been identified and they form a whole class of Dirac-type materials. These interesting systems host massless as well as massive particles described by relativistic-like Hamiltonians in one, two or three spatial dimensions. Several interesting systems from this class have recently been studied in our group using tools of optical magneto-spectroscopy in a broad, from THz up to visible, spectral range.

Cyclotron emission from massless Kane electrons

Kane versus Dirac massless electrons in cadmium arseni

Massive Dirac electrons in bulk Bi2Se3

Massless Kane electrons in gapless HgCdTe