Strained bilayer WSe2 with reduced exciton-phonon coupling

Aslan, Ozgur Burak; Deng, Minda; Brongersma, Mark L.; Heinz, Tony F.

doi:10.1103/physrevb.101.115305

Title: Strained bilayer ${WSe}_{2}$ with reduced exciton-phonon coupling

Journal Article · 23 March 2020 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.101.115305 · OSTI ID:1605986

^[1]; Deng, Minda ^[2]; Brongersma, Mark L. ^[1];

^[2]

Stanford Univ., CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Herein we investigate excitonic absorption and emission in bilayer WSe₂ under tensile strain. We observe a redshift of 110 meV in the energy of the $$A$$ exciton absorption peak (at the direct gap at the $$K$$ point in the Brillouin zone) under 2.1% uniaxial tensile strain. In addition, under the same strain, the spectral linewidth of the $$A$$ exciton at room temperature decreases by a factor of 2, from 70 to 36 meV. We show that this decrease is a result of suppression of phonon-mediated exciton scattering channels. This suppression is associated with the relative upshift under strain of the $$Q$$ valley in the conduction band (involved in the indirect exciton emission), which is nearly degenerate with the $$K$$ valley (involved in the A exciton). We analyze the strain-dependent absorption and photoluminescence spectra to determine the relative positions of these valleys and to infer intervalley scattering rates. Our model describes well the decrease and the distinct trends in the $$A$$ exciton linewidth of monolayer and bilayer WSe₂ under strain. The results show that strain can be used to tune, as well as to probe, the relative energies of band extrema and exciton scattering channels in two-dimensional semiconductors.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC02-76SF00515; DMR-1420634; SC0019140; FA9550-17-1-0002

OSTI ID:: 1605986

Alternate ID(s):: OSTI ID: 1605972; OSTI ID: 1616991

Journal Information:: Physical Review B, Vol. 101, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Title: Strained bilayer WSe 2 with reduced exciton-phonon coupling

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Title: Strained bilayer ${WSe}_{2}$ with reduced exciton-phonon coupling