Linearly Polarized Excitons in Single- and Few-Layer ReS2 Crystals

Ozgur Burak Aslan, Daniel A. Chenet, Arend van der Zande, James C. Hone, Tony F. Heinz

Research output: Contribution to journalArticle

Abstract

Rhenium disulfide (ReS2), a layered group VII transition metal dichalcogenide, has been studied by optical spectroscopy. We demonstrate that the reduced crystal symmetry, as compared to the molybdenum and tungsten dichalcogenides, leads to anisotropic optical properties that persist from the bulk down to the monolayer limit. We find that the direct optical gap blueshifts from 1.47 eV in the bulk to 1.61 eV in the monolayer limit. In the ultrathin limit, we observe polarization-dependent absorption and polarized emission from the band-edge optical transitions. We thus establish ultrathin ReS2 as a birefringent material with strongly polarized direct optical transitions that vary in energy and orientation with sample thickness. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)96-101
Number of pages6
JournalACS Photonics
Volume3
Issue number1
DOIs
StatePublished - Jan 20 2016

Keywords

  • birefringence
  • excitons
  • layered 2D materials
  • optical absorption spectrum
  • optical anisotropy
  • photoluminescence
  • rhenium disulfide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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