Topological Crystalline Transition Metals: Strained W, Ta, Mo, and Nb

Abstract

In a joint theoretical and experimental investigation we show that a series of transition metals with strained body-centered cubic lattice ---W, Ta, Nb, and Mo--- host surface states that are topologically protected by mirror symmetry. Our finding extends the class of topologically nontrivial systems by topological crystalline transition metals. The investigation is based on independent calculations of the electronic structures and of topological invariants, the results of which agree with established properties of the Dirac-type surface state in W(110). To further support our prediction, we investigate both experimentally by spin-resolved inverse photoemission and theoretically an unoccupied topologically nontrivial surface state in Ta(110).

arXiv comment5 pages, 4 figures

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• Double Band Inversion in $\alpha$-Sn: Appearance of Topological Surface States and the Role of Orbital Composition
• Systematic study of Mn atoms, artificial dimers and chains on superconducting Ta(110)
• Epitaxy enhancement in oxide/tungsten heterostructures by harnessing the interface adhesion