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 language | English (US) |
|---|---|
| Article number | 241411 |
| Journal | Physical Review B |
| Volume | 96 |
| Issue number | 24 |
| DOIs | |
| State | Published - Dec 21 2017 |
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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 journal › Article
}
TY - JOUR
T1 - Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides
AU - Kaasbjerg, Kristen
AU - Martiny, Johannes H.J.
AU - Low, Tony
AU - Jauho, Antti Pekka
PY - 2017/12/21
Y1 - 2017/12/21
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.96.241411
DO - 10.1103/PhysRevB.96.241411
M3 - Article
VL - 96
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 24
M1 - 241411
ER -