Experimental Realization of Type-II Dirac Fermions in a PdTe2 Superconductor
SCIE
SCOPUS
- Title
- Experimental Realization of Type-II Dirac Fermions in a PdTe2 Superconductor
- Authors
- Noh, Han-Jin; Jeong, Jinwon; Cho, En-Jin; Kim, Kyoo; MIN, BYUNG IL; Park, Byeong-Gyu
- Date Issued
- 2017-07
- Publisher
- AMER PHYSICAL SOC
- Abstract
- A Dirac fermion in a topological Dirac semimetal is a quadruple-degenerate quasiparticle state with a relativistic linear dispersion. Breaking either time-reversal or inversion symmetry turns this system into a Weyl semimetal that hosts double-degenerate Weyl fermion states with opposite chiralities. These two kinds of quasiparticles, although described by a relativistic Dirac equation, do not necessarily obey Lorentz invariance, allowing the existence of so-called type-II fermions. The recent theoretical discovery of type-II Weyl fermions evokes the prediction of type-II Dirac fermions in
PtSe
2
-type transition metal dichalcogenides, expecting experimental confirmation. Here, we report an experimental realization of type-II Dirac fermions in
PdTe
2
by angle-resolved photoemission spectroscopy combined with ab initio band calculations. Our experimental finding shows the first example that has both superconductivity and type-II Dirac fermions, which turns the topological material research into a new phase.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/41067
- DOI
- 10.1103/PhysRevLett.119.016401
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 119, no. 1, page. 016401 - 016401, 2017-07
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