Electrically Tunable Valley Dynamics in Twisted WSe_{2}/WSe_{2} Bilayers

Physical Review Letters
Giovanni ScuriHongkun Park

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.

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Citations

Nov 26, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jinfeng QuJianxin Zhong
Feb 12, 2021·The Journal of Physical Chemistry Letters·Fabio Caruso
Jan 13, 2021·Nature Communications·Dorri HalbertalD N Basov
Jan 6, 2021·Nature Materials·Trond I AndersenMikhail D Lukin
Nov 20, 2020·Nature Communications·Long ZhangHui Deng
Mar 1, 2020·Nature Communications·D M KennesA Rubio
May 5, 2021·Chemical Society Reviews·Yanping LiuXidong Duan
Jun 3, 2021·Nanomaterials·Georgy A ErmolaevValentyn S Volkov
Jul 7, 2021·ACS Applied Materials & Interfaces·Miriam KarpińskaPaulina Plochocka
Jul 24, 2021·Nanotechnology·Rahul DebnathArindam Ghosh
Feb 5, 2022·Advanced Materials·Sathvik Ajay IyengarVenkataraman Swaminathan

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