title: Magneto-optics of massive dirac fermions in bulk Bi2Se3.
abstract: 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.
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.|Institute of Physics, Charles University in Prague, CZ-12116 Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Orlita
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: B A
authors.initials: BA
authors.lastname: Piot
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Martinez
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: N K Sampath
authors.initials: NK
authors.lastname: Kumar
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Faugeras
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Potemski
authors.affiliation: Institute for Theoretical Physics, TP IV, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Michel
authors.affiliation: Institute for Theoretical Physics, TP IV, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: E M
authors.initials: EM
authors.lastname: Hankiewicz
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Brauner
authors.affiliation: Faculty of Chemical Technology, University of Pardubice, CZ-53210 Pardubice, Czech Republic.
authors.forename: Č
authors.initials: Č
authors.lastname: Drašar
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Schreyeck
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Grauer
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Brunner
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Gould
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Brüne
authors.affiliation: Physikalisches Institut (EP III), Universität Würzburg, D-97074 Würzburg, Germany.
authors.forename: L W
authors.initials: LW
authors.lastname: Molenkamp