Valley-polarized exciton dynamics in a 2D semiconductor heterostructure

Science
Pasqual RiveraXiaodong Xu

Abstract

Heterostructures comprising different monolayer semiconductors provide an attractive setting for fundamental science and device technologies, such as in the emerging field of valleytronics. We realized valley-specific interlayer excitons in monolayer WSe2-MoSe2 vertical heterostructures. We created interlayer exciton spin-valley polarization by means of circularly polarized optical pumping and determined a valley lifetime of 40 nanoseconds. This long-lived polarization enables the visualization of the expansion of a valley-polarized exciton cloud over several micrometers. The spatial pattern of the polarization evolves into a ring with increasing exciton density, a manifestation of valley exciton exchange interactions. Our work introduces van der Waals heterostructures as a promising platform from which to study valley exciton physics.

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Citations

Oct 19, 2016·Scientific Reports·Kathleen M McCrearyBerend T Jonker
Dec 28, 2016·Nano Letters·Simone LatiniKristian S Thygesen
Dec 23, 2016·Nano Letters·Jason S RossXiaodong Xu
Jan 14, 2017·Nano Letters·Colin M ChowXiaodong Xu
Mar 21, 2017·Nanoscale·Wanshun XiaZhiming Wang
Apr 6, 2017·Physical Chemistry Chemical Physics : PCCP·Kuan ZhouRoger K Lake
May 10, 2017·Nanoscale·Shinichiro MouriKazunari Matsuda
Dec 15, 2016·Nature Communications·John R SchaibleyXiaodong Xu
Mar 11, 2017·Science·Edbert J SieNuh Gedik
Jul 26, 2017·Nano Letters·Bastian MillerUrsula Wurstbauer
Apr 11, 2018·Nature Communications·Wei-Ting HsuWen-Hao Chang
Oct 3, 2017·Nature Materials·Masaru OngaYoshihiro Iwasa
Sep 25, 2017·Nature Communications·Ashish AroraRudolf Bratschitsch
Jun 15, 2018·Advanced Materials·Jiang Pu, Taishi Takenobu
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Sep 25, 2018·Physical Chemistry Chemical Physics : PCCP·Hao WangYing Dai
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Apr 27, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jaehong ParkJung-Hae Choi
Dec 6, 2019·Nature Communications·Paul D CunninghamBerend T Jonker

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