PropertyValue
?:abstract
  • The twist degree of freedom provides a powerful new tool for engineering the electrical and optical properties of van der Waals heterostructures. Here, we show that the twist angle can be used to control the spin-valley properties of transition metal dichalcogenide bilayers by changing the momentum alignment of the valleys in the two layers. Specifically, we observe that the interlayer excitons in twisted WSe_{2}/WSe_{2} bilayers exhibit a high (>60%) degree of circular polarization (DOCP) and long valley lifetimes (>40 ns) at zero electric and magnetic fields. The valley lifetime can be tuned by more than 3 orders of magnitude via electrostatic doping, enabling switching of the DOCP from ∼80% in the n-doped regime to <5% in the p-doped regime. These results open up new avenues for tunable chiral light-matter interactions, enabling novel device schemes that exploit the valley degree of freedom.
is ?:annotates of
?:creator
?:journal
  • Phys_Rev_Lett
?:license
  • unk
?:publication_isRelatedTo_Disease
?:source
  • WHO
?:title
  • Electrically Tunable Valley Dynamics in Twisted WSe_{2}/WSe_{2} Bilayers
?:type
?:who_covidence_id
  • #32530686
?:year
  • 2020

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