期刊
ACS PHOTONICS
卷 3, 期 1, 页码 96-101出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00486
关键词
layered 2D materials; rhenium disulfide; optical anisotropy; excitons; birefringence; optical absorption spectrum; photoluminescence
类别
资金
- Air Force Office of Scientific Research [FA9550-14-1-0268]
- National Science Foundation [DMR-1124894]
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
- Columbia University
- Center for Functional Nanomaterials at Brookhaven National Laboratory
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.
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