title: Magneto-Optical Signature of Massless Kane Electrons in Cd_{3}As_{2}.
abstract: We report on optical reflectivity experiments performed on Cd_{3}As_{2} over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of 3D massless charge carriers. The specific cyclotron resonance absorption in the quantum limit implies that we are probing massless Kane electrons rather than symmetry-protected 3D Dirac particles. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments.
authors.affiliation: DQMP, University of Geneva, CH-1211 Geneva 4, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Akrap
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Hakl
authors.affiliation: LPS, Université Paris-Sud, Université Paris-Saclay, CNRS UMR 8502, 91405 Orsay, France.
authors.forename: S
authors.initials: S
authors.lastname: Tchoumakov
authors.affiliation: GAP-Biophotonics, University of Geneva, CH-1211 Geneva 4, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Crassee
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.|CEITEC BUT, Brno University of Technology, 616 00 Brno, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Kuba
authors.affiliation: LPS, Université Paris-Sud, Université Paris-Saclay, CNRS UMR 8502, 91405 Orsay, France.
authors.forename: M O
authors.initials: MO
authors.lastname: Goerbig
authors.affiliation: CMPMS, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: C C
authors.initials: CC
authors.lastname: Homes
authors.affiliation: CEITEC MU, Masaryk University, Faculty of Science, 61137 Brno, Czech Republic.
authors.forename: O
authors.initials: O
authors.lastname: Caha
authors.affiliation: CEITEC MU, Masaryk University, Faculty of Science, 61137 Brno, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Novák
authors.affiliation: Laboratoire Charles Coulomb, CNRS, Université Montpellier, 34095 Montpellier, France.
authors.forename: F
authors.initials: F
authors.lastname: Teppe
authors.affiliation: Laboratoire Charles Coulomb, CNRS, Université Montpellier, 34095 Montpellier, France.
authors.forename: W
authors.initials: W
authors.lastname: Desrat
authors.affiliation: The Institute for Quantum Matter, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: S
authors.initials: S
authors.lastname: Koohpayeh
authors.affiliation: The Institute for Quantum Matter, The Johns Hopkins University, Baltimore, Maryland 21218, USA.|Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: L
authors.initials: L
authors.lastname: Wu
authors.affiliation: The Institute for Quantum Matter, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: N P
authors.initials: NP
authors.lastname: Armitage
authors.affiliation: Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Moldova.
authors.forename: A
authors.initials: A
authors.lastname: Nateprov
authors.affiliation: Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Moldova.
authors.forename: E
authors.initials: E
authors.lastname: Arushanov
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Q D
authors.initials: QD
authors.lastname: Gibson
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava
authors.affiliation: DQMP, University of Geneva, CH-1211 Geneva 4, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: van der Marel
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: B A
authors.initials: BA
authors.lastname: Piot
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: C
authors.initials: C
authors.lastname: Faugeras
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Martinez
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Potemski
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France.|Institute of Physics, Charles University in Prague, 12116 Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Orlita