Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides

Kristen Kaasbjerg, Johannes H.J. Martiny, Tony Low, Antti Pekka Jauho

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides (TMDs; MX2) presents a serious obstacle for applications exploiting their unique valley-contrasting properties. Here, we show that the symmetry of the atomic defects can give rise to an unconventional protection mechanism against intervalley scattering in monolayer TMDs. The predicted defect-dependent selection rules for intervalley scattering can be verified via Fourier transform scanning tunneling spectroscopy (FT-STS), and provide a unique identification of, e.g., atomic vacancy defects (M vs X). Our findings put the absence of the intervalley FT-STS peak in recent experiments in a different perspective.

Original languageEnglish (US)
Article number241411
JournalPhysical Review B
Volume96
Issue number24
DOIs
StatePublished - Dec 21 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

Fingerprint

Dive into the research topics of 'Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides'. Together they form a unique fingerprint.

Cite this