Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: 2D Materials Beyond Graphene III

O 70.1: Vortrag

Mittwoch, 22. März 2017, 10:30–10:45, WIL A317

Band structure and excitons of monolayer and bulk ReSe2: A many-body view — •Jonathan Noky1, Matthias Drüppel1, Philipp Eickholt2, Thorsten Deilmann3, Koji Miyamoto4, Peter Krüger1, Markus Donath2, and Michael Rohlfing11Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, 48149 Münster, Germany — 2Physikalisches Institut, Westfälische Wilhelms-Universität, 48149 Münster, Germany — 3Center for Atomic-Scale Materials Design (CAMD), Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark — 4Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

Transition metal dichalcogenides (TMDCs) are a fascinating new class of semiconductors, which attracted a lot of interest in the past few years. They are promising materials for new optical and electronic devices on the nanoscale. Here, we focus on one of the less studied members of this group: ReSe2. In contrast to other TMDCs, it grows in a distorted 1T structure, which leads to new anisotropic properties.

We present electronic and excitonic spectra for both monolayer and bulk ReSe2 within many-body perturbation theory (MBPT). For this, we apply the GW-BSE (Bethe-Salpeter equation) approach within the efficient LDA+GdW approximation [1]. Our results on the quasiparticle band structure are complemented with experimental ARPES data. Based on the band structure we investigate the excitons. The lowest four states show distinct dipolar characteristics, which is in contrast to many other TMDCs.

[1] M. Rohlfing, Phys. Rev. B. 82, 205127 (2010)

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