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      Electronic bandstructure and van der Waals coupling of ReSe 2 revealed by high-resolution angle-resolved photoemission spectroscopy

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          Abstract

          ReSe 2 and ReS 2 are unusual compounds amongst the layered transition metal dichalcogenides as a result of their low symmetry, with a characteristic in-plane anisotropy due to in-plane rhenium ‘chains’. They preserve inversion symmetry independent of the number of layers and, in contrast to more well-known transition metal dichalcogenides, bulk and few-monolayer Re-TMD compounds have been proposed to behave as electronically and vibrational decoupled layers. Here, we probe for the first time the electronic band structure of bulk ReSe 2 by direct nanoscale angle-resolved photoemission spectroscopy. We find a highly anisotropic in- and out-of-plane electronic structure, with the valence band maxima located away from any particular high-symmetry direction. The effective mass doubles its value perpendicular to the Re chains and the interlayer van der Waals coupling generates significant electronic dispersion normal to the layers. Our density functional theory calculations, including spin-orbit effects, are in excellent agreement with these experimental findings.

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          Van der Waals heterostructures

          Research on graphene and other two-dimensional atomic crystals is intense and likely to remain one of the hottest topics in condensed matter physics and materials science for many years. Looking beyond this field, isolated atomic planes can also be reassembled into designer heterostructures made layer by layer in a precisely chosen sequence. The first - already remarkably complex - such heterostructures (referred to as 'van der Waals') have recently been fabricated and investigated revealing unusual properties and new phenomena. Here we review this emerging research area and attempt to identify future directions. With steady improvement in fabrication techniques, van der Waals heterostructures promise a new gold rush, rather than a graphene aftershock.
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            The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties

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              Giant spin-orbit-induced spin splitting in two-dimensional transition-metal dichalcogenide semiconductors

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                Author and article information

                Contributors
                d.wolverson@bath.ac.uk
                maria-carmen.asensio@synchrotron-soleil.fr
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                11 July 2017
                11 July 2017
                2017
                : 7
                : 5145
                Affiliations
                [1 ]ISNI 0000 0001 2162 1699, GRID grid.7340.0, Centre for Nanoscience and Nanotechnology, , Department of Physics, University of Bath, ; Bath, BA2 7AY United Kingdom
                [2 ]ISNI 0000 0004 4910 6535, GRID grid.460789.4, Synchrotron SOLEIL, , Saint Aubin, and Université Paris-Saclay, ; BP 48 91192 Gif-sur-Yvette, France
                Article
                5361
                10.1038/s41598-017-05361-6
                5506037
                7b803cf4-860d-48f0-aa13-b1198cfff210
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 15 March 2017
                : 26 May 2017
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