Local strain and tunneling current modulated excitonic luminescence in MoS2 monolayers

Submitting author affiliation:
Nanotechnology Group, ETH Zurich, Rüschlikon, Switzerland

Beilstein Arch. 2021, 202190. https://doi.org/10.3762/bxiv.2021.90.v1

Published 22 Dec 2021

This preprint has not been peer-reviewed. When a peer-reviewed version is available, this information will be updated.


The excitonic luminescence of monolayer molybdenum disulfide (MoS2) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS2 is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission can be modulated by the tunneling current, since the A exciton emission intensity saturates at high tunneling currents. Moreover, the corrugated gold substrate introduces local strain to the monolayer MoS2, resulting in significant changes of electronic bandgap and valence band splitting. The modulation rates of strain on A and B exciton energies are estimated as -72 meV/% and -57 meV/%, respectively. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS2 with a spatial resolution <10 nm. 

Keywords: Transition metal dichalcogenides (TMDCs); scanning tunneling microscopy (STM); excitonic luminescence; local strain; exciton-exciton annihilation

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When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Ma, Y.; Kalt, R. A.; Stemmer, A. Beilstein Arch. 2021, 202190. doi:10.3762/bxiv.2021.90.v1

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