Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Two-dimensional Materials I (joint session HL/CPP)
HL 17.10: Vortrag
Dienstag, 2. April 2019, 12:00–12:15, H36
Transport and photoelectron spectroscopy of few-layer epitaxial WSe2 — •Hiro Nakamura1, Avaise Mohammed1, Philipp Rosenzweig1, Kathrin Müller1, Peter Wochner1, Armin Schulz1, Mona Stadler2, Michael Jetter2, Peter Michler2, Ulrich Starke1, and Hidenori Takagi1,3,4 — 1Max Planck Institute for Solid State Research — 2Institut für Halbleiteroptik und Funktionelle Grenzflächen, University of Stuttgart — 3Department of Physics, University of Tokyo — 4Institute for Functional Matter and Quantum Technologies, University of Stuttgart
Giant spin splitting of monolayer WSe2 is an interesting element both for spintronics and topological phenomena. Here, we present electronic and structural properties of few-layer WSe2 grown by hybrid pulsed-laser deposition. Angle-resolved, ultraviolet and X-ray photoelectron spectroscopy reveal the band structure of monolayer WSe2 including strong spin-orbit splitting, as well as clarify the band alignment between WSe2 and the underlying graphene/SiC substrate, indicating electron transfer from graphene to WSe2. To access the valence bands in transport, hole-doping of few-layer WSe2 has been performed using Nb as a dopant. The Hall effect and transport measurements confirmed the expected density of hole carriers, and associated metallic conduction down to low temperatures for optimal films. Synchrotron X-ray diffraction sheds further light on structure-property relationships, in particular strain effects in the WSe2 layer.