Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2

Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2 We report on a systematic study of type-II Dirac fermions in a layered crystal of PdTe2. De Haas–van Alphen oscillations show a small Fermi-surface pocket with a cross section of 0.077nm−2 with a nontrivial Berry phase. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. We propose that PdTe2 is an improved platform to host topological superconductors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2

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Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2

Abstract

We report on a systematic study of type-II Dirac fermions in a layered crystal of PdTe2. De Haas–van Alphen oscillations show a small Fermi-surface pocket with a cross section of 0.077nm−2 with a nontrivial Berry phase. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. We propose that PdTe2 is an improved platform to host topological superconductors.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.041201
Publisher site
See Article on Publisher Site

Abstract

We report on a systematic study of type-II Dirac fermions in a layered crystal of PdTe2. De Haas–van Alphen oscillations show a small Fermi-surface pocket with a cross section of 0.077nm−2 with a nontrivial Berry phase. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. We propose that PdTe2 is an improved platform to host topological superconductors.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 5, 2017

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