Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H37: 2D Materials - Optics and Excitons IV
2:30 PM–5:18 PM,
Tuesday, March 6, 2018
LACC Room: 411
Sponsoring Unit: DMP
Chair: Eric Stinaff, Ohio Univ
Abstract: H37.00009 : Raman studies of anisotropic properties of ReSe2*
4:30 PM–4:42 PM
Soo Yeon Lim
Soo Yeon Lim
Jung Hwa Kim
ReSe2 is a van der Waals layered semiconductor with an indirect bandgap of ~ 1.3 eV which is smaller than most transition metal dichalcogenides (TMDCs). ReSe2 has a distorted octahedral structure (1T') with much lower symmetry and in-plane anisotropy compared to other hexagonal TMDCs such as MoS2 and WS2 . Due to the structural in-plane anisotropy resulting in an optical and electrical anisotropy, ReSe2 can be used as polarization sensitive optoelectronic devices . We studied polarization dependence of Raman response with different excitation energies. The polarization dependence patterns vary dramatically with different excitation energies. In particular, we determined the direction of the rhenium chains with a mode at ~ 160 cm-1 by using the 1.96 eV-excitation and confirmed it with HRSTEM measurements. In addition, we developed a method to determine front and back sides of a sample.
 J. A. Wilson et al., Advances in Physics 18, 193 (1969).
 Shengxue Yang et al., Scientific Reports 4, 5442 (2014).
*It was supported by the NRF grant funded by the Korean government (NRF-2016R1A2B3008363 and No. 2017R1A5A1014862, SRC program: vdWMRC center) and by a grant (No. 2011-0031630) from the Center for Advanced Soft Electronics.
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