Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 100: Electronic Structure of Surfaces II

O 100.7: Vortrag

Donnerstag, 19. März 2020, 12:00–12:15, REC C 213

In operando angle-resolved photoemission on a graphene device — •Davide Curcio1, Alfred Jones1, Jyoti Katoch2, Klara Volckaert1, Deepnarayan Biswas1, Ryan Muzzio2, Charlotte E. Sanders3, Pavel Dudin4, Cephise Cacho4, Jill A. Miwa1, Søren Ulstrup1, and Philip Hofmann11Aarhus University, Denmark — 2Carnegie Mellon University, USA — 3Central Laser Facility, STFC Rutherford Appleton Laboratory, UK — 4Diamond Light Source, UK

The electronic structure and properties of two-dimensional (2D) ma- terials are widely tuneable via the choice of substrate, vertical elec- tric fields or subtle structural features, and surprising new proper- ties such as gate-switchable superconductivity have been observed in transport experiments. The directly accessible surface of 2D materi- als permits, at least in principle, a simultaneous study of transport properties and electronic structure using in-operando angle-resolved photoemission spectroscopy (ARPES). So far, this has been achieved for applied gating voltages but not in presence of a steady state cur- rent through the device, mainly because a large voltage drop within the area of the UV light spot proves detrimental to the energy resolution of the experiment. Here, using a graphene device as a model system, we show that this restriction can be overcome with a nano-scale light spot. We demonstrate non-invasive nanoARPES spectroscopy of the spectral function in a graphene device for current densities of up to 107Acm−2, mapping properties such as the local doping, many-body effects, conductivity, and carrier mobility.

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