Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: 2D materials beyond graphene: TMDCs, silicene and relatives III
O 91.5: Vortrag
Donnerstag, 15. März 2018, 11:30–11:45, MA 043
Bismuth-intercalated WS2 on Ag(111): a nearly free-standing single-layer TMDC — •Maciej Dendzik1,2, Sanjoy Mahatha2, Charlotte Sanders2, Matteo Michiardi2,3, Marco Bianchi2, Jill Miwa2, and Philip Hofmann2 — 1Department of Physical Chemistry, Fritz-Haber-Institut of the Max Planck Society, Faradayweg 4-6, Berlin 14915, Germany — 2Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark — 3Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
Recent developments in the field of two-dimensional transition metal dichalcogenides (TMDCs) have shown that the substrate can have a profound effect on the electronic band structure of these materials [1-3]. For example, a semiconducting single-layer (SL) WS2 was found to be metallic when grown on Ag(111) [4]. Here we demonstrate that bismuth intercalation can be used to effectively decouple SL WS2 from the substrate. Angle-resolved photoemission spectroscopy (ARPES) measurements indicate a nearly free-standing character of WS2 after intercalation. Low-energy electron diffraction (LEED) and scanning-tunneling microscopy (STM) results shed further light on the crystal structure of the investigated WS2-Bi-Ag complex.
[1] J. A. Miwa et al., Phys. Rev. Lett., 114, 046802, 2015.
[2] M. Dendzik et al., Phys. Rev. B, 92, 245442, 2015.
[3] C. E. Sanders et al., Phys. Rev. B, 94, 081404 (R), 2016.
[4] M. Dendzik et al., Phys. Rev. B, in press.