Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures

Nature Communications
Chongyun JiangWei-Bo Gao

Abstract

Transition metal dichalcogenides have valley degree of freedom, which features optical selection rule and spin-valley locking, making them promising for valleytronics devices and quantum computation. For either application, a long valley polarization lifetime is crucial. Previous results showed that it is around picosecond in monolayer excitons, nanosecond for local excitons and tens of nanosecond for interlayer excitons. Here we show that the dark excitons in two-dimensional heterostructures provide a microsecond valley polarization memory thanks to the magnetic field induced suppression of valley mixing. The lifetime of the dark excitons shows magnetic field and temperature dependence. The long lifetime and valley polarization lifetime of the dark exciton in two-dimensional heterostructures make them promising for long-distance exciton transport and macroscopic quantum state generations.

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Citations

Nov 7, 2018·Nature Nanotechnology·Chenhao JinTony F Heinz
Aug 20, 2019·Nature Communications·Michael FörgAlexander Högele
Aug 18, 2018·Physical Review Letters·Galan MoodyKevin L Silverman
May 27, 2020·Nature Materials·Mauro Brotons-GisbertBrian D Gerardot
Sep 13, 2020·Science Advances·H BaekB D Gerardot
Mar 6, 2019·Nature Nanotechnology·Xin LuAjit Srivastava
Dec 2, 2020·Nature Nanotechnology·Weijie LiAjit Srivastava
Jan 13, 2021·Small·Tong YeDehui Li
Dec 11, 2020·Light, Science & Applications·Yuhan WangFengqiu Wang
Mar 14, 2021·Nature Communications·Michael FörgAlexander Högele
Apr 4, 2021·Light, Science & Applications·Ying JiangAnlian Pan
May 10, 2021·Light, Science & Applications·Kai-Qiang Lin
Jul 25, 2021·Science Advances·Qinghai TanWei-Bo Gao
Aug 4, 2021·Proceedings of the National Academy of Sciences of the United States of America·Hongli GuoGang Lu
Dec 18, 2020·ACS Applied Materials & Interfaces·Hongzhi ShenDehui Li
Jan 1, 2020·Nano Letters·Zumeng HuangWeibo Gao
Sep 17, 2021·Nature Communications·Cedric RobertXavier Marie

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