Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: 2D Materials IV: Charge Density Waves and Electronic Properties
O 87.4: Vortrag
Donnerstag, 4. April 2019, 15:45–16:00, H25
Using microARPES to measure the charge density wave gap of 1T-VSe2 — •Alfred J. H. Jones1,2, Jude Laverock1, Charles J. Sayers3, Mattia Cattelan4, Simon J. Bending3, Liam S. Farrar3, Enrico Da Como3, and Neil A. Fox1,4 — 1H. H. Wills Physics Laboratory, University of Bristol, UK — 2Department of Physics and Astronomy, Aarhus University, DK — 3Centre for Nanoscience and Nanotechnology, University of Bath, UK — 4School of Chemistry, University of Bristol, UK
Charge density wave (CDW) order, as seen in a number of the layered two dimensional (2D) transition metal dichalcogenides (TMDCs), leads to many and varied changes to the lattice and electronic structure. Such phenomena continue to be poorly understood for a number of strongly correlated metals, including the metallic TMDCs. Within this class of TMDCs, 1T-VSe2 is especially interesting due to the strong 3D character of the CDW.
Here I will report on measurements of the electronic structure of VSe2 taken from a single domain of the bulk crystal using microARPES. These measurements were made using the NanoESCA, an energy filtered PEEM instrument capable of analysing the band structure of materials from regions as small as three microns. I will present the momentum and temperature dependence of the gap that opens in the spectral function of VSe2, and show that the observed behaviour is in good agreement with a mean-field weak coupling description.