2015/04/10 by M. Orlita, B. A. Piot, G. Martinez +17 · 2 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Band gap #Condensed matter physics #Dirac (video compression format) #Dirac fermion #Fermion #Graphene #Graphene research and applications #Hamiltonian (control theory) #Magnetic field #Magneto optical #Physics #Quantum mechanics #Semimetal #Topological Materials and Phenomena #Topological insulator #Weyl semimetal #cond-mat.mes-hall #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevlett.114.186401
published as Phys. Rev. Lett. 114, 186401 (2015) · 5 pages, 3 figures and Supplementary materials, to be published in Physical Review Letters
arxiv created 2015/04/10 · openalex publication_date 2015/05/06 · arxiv updated 2015/05/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on magneto-optical studies of Bi2Se3, a representative member of the 3D topological insulator family. Its electronic states in bulk are shown to be well described by a simple Dirac-type Hamiltonian for massive particles with only two parameters: the fundamental band gap and the band velocity. In a magnetic field, this model implies a unique property-spin splitting equal to twice the cyclotron energy: Es=2Ec. This explains the extensive magnetotransport studies concluding a fortuitous degeneracy of the spin and orbital split Landau levels in this material. The Es=2Ec match differentiates the massive Dirac electrons in bulk Bi2Se3 from those in quantum electrodynamics, for which Es=Ec always holds.