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Strain_tuning_interlayer_exciton_MoS2_20190809.pdf (2.55 MB)
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Biaxial Strain Tuning of Interlayer Excitons in Bilayer MoS2

preprint
submitted on 09.08.2019 and posted on 09.08.2019 by Felix Carrascoso, Der-Yuh Lin, Riccardo Frisenda, Andres Castellanos-Gomez

We show how the excitonic features of biaxial MoS2 flakes are very sensitive to biaxial strain. We find a lower bound for the gauge factors of the A exciton and B exciton of (-41 ± 2) meV/% and (-45 ± 2) meV/% respectively, which are larger than those found for single-layer MoS2. Interestingly, the interlayer exciton feature also shifts upon biaxial strain but with a gauge factor that is systematically larger than that found for the A exciton, (-48 ± 4) meV/%. We attribute this larger gauge factor for the interlayer exciton to the strain tunable van der Waals interaction due to the Poisson effect (the interlayer distance changes upon biaxial strain).

Funding

ERC-StG 2017 (grant agreement n° 7556)

EU Graphene Flagship funding (Grant Graphene Core 2, 785219)

Spanish Ministry of Economy, Industry and Competitiveness (Juan de la Cierva-formación fellowship 2017 FJCI-2017-32919)

Ministry of Science and Technology of Taiwan (No. MOST 108-2221-E-018-010)

History

Email Address of Submitting Author

andres.castellanos@csic.es

Institution

Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)

Country

Spain

ORCID For Submitting Author

0000-0002-3384-3405

Declaration of Conflict of Interest

No conflict of interest

Exports