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Prediction of Weyl semimetal in orthorhombicMoTe2
Open accessAbstract
We investigate the orthorhombic phase $({T}_{d})$ of the layered transition-metal dichalcogenide ${\mathrm{MoTe}}_{2}$ as a Weyl semimetal candidate. ${\mathrm{MoTe}}_{2}$ exhibits four pairs of Weyl points lying slightly above $(\ensuremath{\sim}6\phantom{\rule{0.16em}{0ex}}\mathrm{meV})$ the Fermi energy in the bulk band structure. Different from its cousin ${\mathrm{WTe}}_{2}$, which was recently predicted to be a type-II Weyl semimetal, the spacing between each pair of Weyl points is found to be as large as 4% of the reciprocal lattice in ${\mathrm{MoTe}}_{2}$ (six times larger than that of ${\mathrm{WTe}}_{2}$). When projected onto the surface, the Weyl points are connected by Fermi arcs, which can be easily accessed by angle-resolved photoemission spectroscopy due to the large Weyl point separation. In addition, we show that the correlation effect or strain can drive ${\mathrm{MoTe}}_{2}$ from a type-II to a type-I Weyl semimetal.
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“Calculations using only slightly smaller lattice parameters showed that two pairs were annihilated by merging along the Γ − X line leaving only two pairs of Weyl points (Sun et al., 2015a).”
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Metadata
- Authors
- Sun, Y., Wu, S.-C., Ali, M. N., Felser, C., & Yan, B.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2015-10-09
- Volume
- 92
- Issue
- 16
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W1783694443
- Cited by
- 626
- References
- 18
- FWCI
- 44.50
- Type
- journal article
- Language
- en
- Open access
- green
- Funders
- Deutsche Forschungsgemeinschaft (EB 518/1-1, DFG-SPP 1666, SFB 1143)
- European Research Council (291472)
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