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On the impact of the stress situation on the optical properties of WSe2 monolayers under high pressure
01 August 2019
Francisco-López, A., Han, B., Lagarde, D., Marie, X., Urbaszek, B., Robert, C., & Goñi, A. (2019). Papers in Physics, 11, 110005.

DOI: https://doi.org/10.4279/pip.110005

 We have studied the optical properties of WSe2 monolayers (ML) by means of photoluminescence (PL), PL excitation (PLE) and Raman scattering spectroscopy at room temperature and as a function of hydrostatic pressure up to ca. 12 GPa. For comparison the study comprises two cases: A single WSe2 ML directly transferred onto one of the diamonds of the diamond anvil cell and a WSe2 ML encapsulated into hexagonal boron nitride (hBN) layers. The pressure dependence of the A and B exciton, as determined by PL and PLE, respectively, is very different for the case of the bare WSe2 ML and the hBN/WSe2-ML/hBN heterostructure. Whereas for the latter the A and B exciton energy increases linearly with increasing pressure at a rate of 3.5 to 3.8 meV/GPa, for the bare WSe2ML the A and B exciton energy decreases with a coefficient of -3.1 and -1.3 meV/GPa, respectively. We interpret that this behavior is due to a different stress situation. For a single ML the stress tensor is essentially uniaxial with the compressive stress component in the direction perpendicular to the plane of the ML. In contrast, for the substantially thicker hBN/WSe2/hBN heterostructure the compression is hydrostatic. The results from an analysis of the pressure dependence of the frequency of Raman active modes comply with the interpretation of having a different stress situation in each case.

On the impact of the stress situation on the optical properties of WSe2 monolayers under high pressure

 

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On the impact of the stress situation on the optical properties of WSe2 monolayers under high pressure




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