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 journalArticle

10 Citations (Scopus)

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

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Transition metals
Monolayers
transition metals
Scattering
Defects
defects
symmetry
scattering
Fourier transforms
Spectroscopy
Scanning
scanning
spectroscopy
Vacancies
valleys
Experiments

Cite this

Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides. / Kaasbjerg, Kristen; Martiny, Johannes H.J.; Low, Tony; Jauho, Antti Pekka.

In: Physical Review B, Vol. 96, No. 24, 241411, 21.12.2017.

Research output: Contribution to journalArticle

Kaasbjerg, Kristen ; Martiny, Johannes H.J. ; Low, Tony ; Jauho, Antti Pekka. / Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides. In: Physical Review B. 2017 ; Vol. 96, No. 24.
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