Internet Archive Scholar

Local strain and tunneling current modulate excitonic luminescence in MoS2 monolayers

Yalan Ma, Romana Alice Kalt, Andreas Stemmer
2022

Preserved Fulltext

fulltext thumbnail
Web Archive Capture PDF (922.6 kB)
https://web.archive.org/web/20220923225901/https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/569822/d2ra05123k.pdf;jsessionid=FFF516D50AE9CED8B2E1D6B1C15BBAA1?sequence=2

A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL. The file type is application/pdf.

The excitonic luminescence of monolayer molybdenum disulfide (MoS 2 ) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS 2 is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission is 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 MoS 2 ,
more » ... ulting in significant changes of electronic bandgap and valence band splitting. The modulation rate of strain on A exciton energy is estimated as À69 AE 5 meV/%. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS 2 on a length scale of 10 nm.
doi:10.3929/ethz-b-000569822 fatcat:iyxempzaubhjpluxhspam6nlmu
Citation

Yalan Ma, Romana Alice Kalt, Andreas Stemmer. "Local strain and tunneling current modulate excitonic luminescence in MoS2 monolayers." (2022)