Biaxial Strain Tuning of Interlayer Excitons in Bilayer MoS2

Felix Carrascoso; Der-Yuh Lin; Riccardo Frisenda; Andres Castellanos-Gomez

doi:10.20944/preprints201908.0139.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 9 August 2019 / Approved: 12 August 2019 / Online: 12 August 2019 (11:43:12 CEST)

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).

2D materials, molybdenum disulfide (MoS2), interlayer exciton, strain engineering, bilayer

Physical Sciences, Condensed Matter Physics

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Biaxial Strain Tuning of Interlayer Excitons in Bilayer MoS₂

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