Semiconductor to metal transition in two-dimensional gold and its van der Waals heterostack with graphene

Stiven Forti (), Stefan Link, Alexander Stöhr, Yuran Niu, Alexei A. Zakharov, Camilla Coletti () and Ulrich Starke
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Stiven Forti: Center for Nanotechnology Innovation @ NEST, Istituto Italiano di Tecnologia
Stefan Link: Max-Planck-Institut für Festkörperforschung
Alexander Stöhr: Max-Planck-Institut für Festkörperforschung
Yuran Niu: Lund University
Alexei A. Zakharov: Lund University
Camilla Coletti: Center for Nanotechnology Innovation @ NEST, Istituto Italiano di Tecnologia
Ulrich Starke: Max-Planck-Institut für Festkörperforschung

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The synthesis of two-dimensional (2D) transition metals has attracted growing attention for both fundamental and application-oriented investigations, such as 2D magnetism, nanoplasmonics and non-linear optics. However, the large-area synthesis of this class of materials in a single-layer form poses non-trivial difficulties. Here we present the synthesis of a large-area 2D gold layer, stabilized in between silicon carbide and monolayer graphene. We show that the 2D-Au ML is a semiconductor with the valence band maximum 50 meV below the Fermi level. The graphene and gold layers are largely non-interacting, thereby defining a class of van der Waals heterostructure. The 2D-Au bands, exhibit a 225 meV spin-orbit splitting along the $$\overline {{\mathrm{\Gamma }}{\mathrm{K}}}$$ΓK¯ direction, making it appealing for spin-related applications. By tuning the amount of gold at the SiC/graphene interface, we induce a semiconductor to metal transition in the 2D-Au, which has not yet been observed and hosts great interest for fundamental physics.

Date: 2020
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DOI: 10.1038/s41467-020-15683-1

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