2018/06/30 by A. A. Dobretsova, A. D. Chepelianskii, N. N. Mikhailov +2
Materials Science · Physics and Astronomy · #Condensed matter physics #Degenerate energy levels #Electron #Graphene research and applications #Isotropy #Landau quantization #Magnetic field #Mixing (physics) #Physics #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum well #Semiclassical physics #Spin (aerodynamics) #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.98.155310
published as Phys. Rev. B 98, 155310 (2018)
openalex created_date 2018/07/10 · openalex publication_date 2018/10/11 · arxiv created 2018/10/16 · arxiv updated 2018/10/17 · openalex updated_date 2026/08/05
We present both the experimental and theoretical investigations of a nontrivial electron Landau-level shift in magnetic field in wide (\ensuremath∼20 nm) HgTe quantum wells: Landau levels split under magnetic fields but become degenerate again when magnetic field increases. We reproduced this behavior qualitatively within an isotropic six-band Kane model; then using semiclassical calculations, we showed this behavior is due to the mixing of the conduction band with a total spin of 3/2 with the next well subband with a spin of 1/2, which reduces the average vertical spin from 3/2 to around 1. This change in the average spin changes the Berry phase, explaining the evolution of Landau levels under magnetic field.