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- Title
Observation of three-dimensional massless Kane fermions in a zinc-blende crystal.
- Authors
Orlita, M.; Basko, D. M.; Zholudev, M. S.; Teppe, F.; Knap, W.; Gavrilenko, V. I.; Mikhailov, N. N.; Dvoretskii, S. A.; Neugebauer, P.; Faugeras, C.; Barra, A-L.; Martinez, G.; Potemski, M.
- Abstract
Solid-state physics and quantum electrodynamics, with its ultrarelativistic (massless) particles, meet in the electronic properties of one-dimensional carbon nanotubes, two-dimensional graphene or topological-insulator surfaces. However, clear experimental evidence for electronic states with a conical dispersion relation in all three dimensions, conceivable for certain bulk materials, is still missing. Here, we study a zinc-blende crystal, HgCdTe, at the point of the semiconductor-to-semimetal topological transition. For this compound, we observe three-dimensional massless electrons, as certified from the dynamical conductivity increasing linearly with the photon frequency, with a velocity of about 106 m s−1. Applying a magnetic field B results in a -dependence of dipole-active inter-Landau-level resonances and spin splitting of Landau levels also following a -dependence-well-established signatures of ultrarelativistic particles but until now not observed experimentally in any solid-state electronic system.
- Subjects
SOLID state physics; QUANTUM electrodynamics; CARBON nanotubes; FERMIONS; ZINC crystals; MAGNETIC fields
- Publication
Nature Physics, 2014, Vol 10, Issue 3, p233
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys2857