2018/12/31 by S. S. Krishtopenko, W. Desrat, K. E. Spirin +14
Materials Science · Physics and Astronomy · #Brillouin zone #Condensed matter physics #Cyclotron #Cyclotron resonance #Dirac (video compression format) #Dirac fermion #Dirac sea #Electron #Fermion #Graphene research and applications #Hamiltonian (control theory) #Helical Dirac fermion #Landau quantization #Massless particle #Physics #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.99.121405
published as Phys. Rev. B 99, 121405 (2019) · Main text and Supplemental Materials, 14 pages, 9 figures
arxiv created 2019/02/15 · openalex publication_date 2019/03/11 · arxiv updated 2019/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We report on the clear evidence of massless Dirac fermions in two-dimensional system based on III-V semiconductors. Using a gated Hall bar made on a three-layer InAs/GaSb/InAs quantum well, we restore the Landau level fan chart by magnetotransport and unequivocally demonstrate a gapless state in our sample. Measurements of cyclotron resonance at different electron concentrations directly indicate a linear band crossing at the \mathrm\ensuremathΓ point of the Brillouin zone. Analysis of experimental data within an analytical Dirac-like Hamiltonian allows us not only to determine the velocity (vF=1.8\ifmmode×\else\texttimes\fi105 m/s) of massless Dirac fermions, but also to demonstrate a significant nonlinear dispersion at high energies.