Local Strain and Tunneling Current Modulate Excitonic Luminescence in MoS Monolayers

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 Oct 6

PMID 36199876

Authors

Yalan Ma

Romana Alice Kalt

Andreas Stemmer

Affiliations

Soon will be listed here.

Abstract

The excitonic luminescence of monolayer molybdenum disulfide (MoS) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS is assigned to the radiative decay of and excitons. The intensity ratio of and exciton emission is modulated by the tunneling current, since the exciton emission intensity saturates at high tunneling currents. Moreover, the corrugated gold substrate introduces local strain to the monolayer MoS, resulting in significant changes of electronic bandgap and valence band splitting. The modulation rate of strain on exciton energy is estimated as -69 ± 5 meV/%. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS on a length scale of 10 nm.

Citing Articles

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