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Existence of topological nontrivial surface states in strained transition metals: W, Ta, Mo, and Nb
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Martin Luther Univ Halle Wittenberg, Inst Phys, Von Seckendorff Pl 1, D-06120 Halle, Saale, Germany..
Max Planck Inst Microstruct Phys, Weinberg 2, D-06120 Halle, Saale, Germany.;Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany..
Martin Luther Univ Halle Wittenberg, Inst Phys, Von Seckendorff Pl 1, D-06120 Halle, Saale, Germany..
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2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 15, 155132Article in journal (Refereed) Published
Abstract [en]

We show that a series of transition metals with strained body-centered cubic lattice-W, Ta, Nb, and Mo-hosts surface states that are topologically protected by mirror symmetry and, thus, exhibits nonzero topological invariants. These findings extend the class of topologically nontrivial systems by topological crystalline transition metals. The investigation is based on calculations of the electronic structures and of topological invariants. The signatures of a Dirac-type surface state in W(110), e.g., the linear dispersion and the spin texture, are verified. To further support our prediction, we investigate Ta(110) both theoretically and experimentally by spin-resolved inverse photoemission: unoccupied topologically nontrivial surface states are observed.

Place, publisher, year, edition, pages
2016. Vol. 94, no 15, 155132
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-308645DOI: 10.1103/PhysRevB.94.155132ISI: 000386098500002OAI: oai:DiVA.org:uu-308645DiVA: diva2:1050766
Funder
German Research Foundation (DFG), SPP 1666
Available from: 2016-11-30 Created: 2016-11-29 Last updated: 2016-11-30Bibliographically approved

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