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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 Rohlfing¹ — ¹Institut 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)