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Landau quantization and quasiparticle interference in the three-dimensional Dirac semimetal Cd3As2.
Jeon, Sangjun; Zhou, Brian B; Gyenis, Andras; Feldman, Benjamin E; Kimchi, Itamar; Potter, Andrew C; Gibson, Quinn D; Cava, Robert J; Vishwanath, Ashvin; Yazdani, Ali.
Afiliação
  • Jeon S; 1] Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA [2].
  • Zhou BB; 1] Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA [2].
  • Gyenis A; Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
  • Feldman BE; Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
  • Kimchi I; Department of Physics, University of California, Berkeley, California 09460, USA.
  • Potter AC; Department of Physics, University of California, Berkeley, California 09460, USA.
  • Gibson QD; Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
  • Cava RJ; Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
  • Vishwanath A; Department of Physics, University of California, Berkeley, California 09460, USA.
  • Yazdani A; Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Nat Mater ; 13(9): 851-6, 2014 Sep.
Article em En | MEDLINE | ID: mdl-24974888
ABSTRACT
Condensed-matter systems provide a rich setting to realize Dirac and Majorana fermionic excitations as well as the possibility to manipulate them for potential applications. It has recently been proposed that chiral, massless particles known as Weyl fermions can emerge in certain bulk materials or in topological insulator multilayers and give rise to unusual transport properties, such as charge pumping driven by a chiral anomaly. A pair of Weyl fermions protected by crystalline symmetry effectively forming a massless Dirac fermion has been predicted to appear as low-energy excitations in a number of materials termed three-dimensional Dirac semimetals. Here we report scanning tunnelling microscopy measurements at sub-kelvin temperatures and high magnetic fields on the II-V semiconductor Cd3As2. We probe this system down to atomic length scales, and show that defects mostly influence the valence band, consistent with the observation of ultrahigh-mobility carriers in the conduction band. By combining Landau level spectroscopy and quasiparticle interference, we distinguish a large spin-splitting of the conduction band in a magnetic field and its extended Dirac-like dispersion above the expected regime. A model band structure consistent with our experimental findings suggests that for a magnetic field applied along the axis of the Dirac points, Weyl fermions are the low-energy excitations in Cd3As2.

Texto completo: 1 Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2014 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2014 Tipo de documento: Article