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Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2

Author(s): Das, Pranab Kumar; Di Sante, D; Vobornik, I; Fujii, J; Okuda, T; et al

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Abstract: The behaviour of electrons and holes in a crystal lattice is a fundamental quantum phenomenon, accounting for a rich variety of material properties. Boosted by the remarkable electronic and physical properties of two-dimensional materials such as graphene and topological insulators, transition metal dichalcogenides have recently received renewed attention. In this context, the anomalous bulk properties of semimetallic WTe2 have attracted considerable interest. Here we report angle-and spin-resolved photoemission spectroscopy of WTe2 single crystals, through which we disentangle the role of W and Te atoms in the formation of the band structure and identify the interplay of charge, spin and orbital degrees of freedom. Supported by first-principles calculations and high-resolution surface topography, we reveal the existence of a layer-dependent behaviour. The balance of electron and hole states is found only when considering at least three Te-W-Te layers, showing that the behaviour of WTe2 is not strictly two dimensional.
Publication Date: Feb-2016
Citation: Das, Pranab Kumar, Di Sante, D, Vobornik, I, Fujii, J, Okuda, T, Bruyer, E, Gyenis, A, Feldman, BE, Tao, J, Ciancio, R, Rossi, G, Ali, MN, Picozzi, S, Yazdani, A, Panaccione, G, Cava, RJ. (2016). Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2. NATURE COMMUNICATIONS, 7 (10.1038/ncomms10847
DOI: doi:10.1038/ncomms10847
ISSN: 2041-1723
Type of Material: Journal Article
Journal/Proceeding Title: NATURE COMMUNICATIONS
Version: Final published version. This is an open access article.

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