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).
Biaxial strain tuning of interlayer excitons in bilayer MoS2 / Carrascoso, F.; Lin, D. -Y.; Frisenda, R.; Castellanos-Gomez, A.. - In: JPHYS MATERIALS. - ISSN 2515-7639. - 3:1(2020). [10.1088/2515-7639/ab4432]
Biaxial strain tuning of interlayer excitons in bilayer MoS2
Frisenda R.
;
2020
Abstract
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).| File | Dimensione | Formato | |
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