Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2

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Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2. / Du, Luojun; Zhang, Qian; Zhang, Tingting; Jia, Zhiyan; Liang, Jing; Liu, Gui Bin; Yang, Rong; Shi, Dongxia; Xiang, Jianyong; Liu, Kaihui; Sun, Zhipei; Yao, Yugui; Zhang, Qingming; Zhang, Guangyu.

In: Physical Review B, Vol. 100, No. 16, 161404, 23.10.2019.

Research output: Contribution to journalArticle

Harvard

Du, L, Zhang, Q, Zhang, T, Jia, Z, Liang, J, Liu, GB, Yang, R, Shi, D, Xiang, J, Liu, K, Sun, Z, Yao, Y, Zhang, Q & Zhang, G 2019, 'Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2', Physical Review B, vol. 100, no. 16, 161404. https://doi.org/10.1103/PhysRevB.100.161404

APA

Du, L., Zhang, Q., Zhang, T., Jia, Z., Liang, J., Liu, G. B., ... Zhang, G. (2019). Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2. Physical Review B, 100(16), [161404]. https://doi.org/10.1103/PhysRevB.100.161404

Vancouver

Author

Du, Luojun ; Zhang, Qian ; Zhang, Tingting ; Jia, Zhiyan ; Liang, Jing ; Liu, Gui Bin ; Yang, Rong ; Shi, Dongxia ; Xiang, Jianyong ; Liu, Kaihui ; Sun, Zhipei ; Yao, Yugui ; Zhang, Qingming ; Zhang, Guangyu. / Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2. In: Physical Review B. 2019 ; Vol. 100, No. 16.

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@article{761154c886664610ac098fb54591ea43,
title = "Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2",
abstract = "Valley-contrasting Berry curvature and orbital magnetic moment have led to highly selective circular polarization of direct excitons at the K valleys in transition-metal dichalcogenides. In addition to K valleys, Q valleys, another critical point in the conduction band, also possess well-defined but distinct magnetic moment. Being akin to the direct excitons at K valleys, indirect excitons associated with Q (K) valleys in the conduction (valence) band could allow circular polarization in principle. Here, we report an experimental observation of the circular polarization of indirect Q-K transitions in noncentrosymmetric bilayer 3R-WS2. In stark contrast to the circular polarization of direct excitons which depolarizes with increasing lattice temperature, the circular polarization of indirect Q-K excitons is extremely robust and independent on the temperature. Such robust circular polarization can be understood as follows: The spin-orbit coupling in the Q valley is much stronger than that in the K point of the conduction band, significantly suppressing the temperature induced valley depolarization. Our results open up opportunities for exotic valleytronics and quantum information processing applications.",
author = "Luojun Du and Qian Zhang and Tingting Zhang and Zhiyan Jia and Jing Liang and Liu, {Gui Bin} and Rong Yang and Dongxia Shi and Jianyong Xiang and Kaihui Liu and Zhipei Sun and Yugui Yao and Qingming Zhang and Guangyu Zhang",
note = "| openaire: EC/H2020/820423/EU//S2QUIP",
year = "2019",
month = "10",
day = "23",
doi = "10.1103/PhysRevB.100.161404",
language = "English",
volume = "100",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "16",

}

RIS - Download

TY - JOUR

T1 - Robust circular polarization of indirect Q-K transitions in bilayer 3R-W S2

AU - Du, Luojun

AU - Zhang, Qian

AU - Zhang, Tingting

AU - Jia, Zhiyan

AU - Liang, Jing

AU - Liu, Gui Bin

AU - Yang, Rong

AU - Shi, Dongxia

AU - Xiang, Jianyong

AU - Liu, Kaihui

AU - Sun, Zhipei

AU - Yao, Yugui

AU - Zhang, Qingming

AU - Zhang, Guangyu

N1 - | openaire: EC/H2020/820423/EU//S2QUIP

PY - 2019/10/23

Y1 - 2019/10/23

N2 - Valley-contrasting Berry curvature and orbital magnetic moment have led to highly selective circular polarization of direct excitons at the K valleys in transition-metal dichalcogenides. In addition to K valleys, Q valleys, another critical point in the conduction band, also possess well-defined but distinct magnetic moment. Being akin to the direct excitons at K valleys, indirect excitons associated with Q (K) valleys in the conduction (valence) band could allow circular polarization in principle. Here, we report an experimental observation of the circular polarization of indirect Q-K transitions in noncentrosymmetric bilayer 3R-WS2. In stark contrast to the circular polarization of direct excitons which depolarizes with increasing lattice temperature, the circular polarization of indirect Q-K excitons is extremely robust and independent on the temperature. Such robust circular polarization can be understood as follows: The spin-orbit coupling in the Q valley is much stronger than that in the K point of the conduction band, significantly suppressing the temperature induced valley depolarization. Our results open up opportunities for exotic valleytronics and quantum information processing applications.

AB - Valley-contrasting Berry curvature and orbital magnetic moment have led to highly selective circular polarization of direct excitons at the K valleys in transition-metal dichalcogenides. In addition to K valleys, Q valleys, another critical point in the conduction band, also possess well-defined but distinct magnetic moment. Being akin to the direct excitons at K valleys, indirect excitons associated with Q (K) valleys in the conduction (valence) band could allow circular polarization in principle. Here, we report an experimental observation of the circular polarization of indirect Q-K transitions in noncentrosymmetric bilayer 3R-WS2. In stark contrast to the circular polarization of direct excitons which depolarizes with increasing lattice temperature, the circular polarization of indirect Q-K excitons is extremely robust and independent on the temperature. Such robust circular polarization can be understood as follows: The spin-orbit coupling in the Q valley is much stronger than that in the K point of the conduction band, significantly suppressing the temperature induced valley depolarization. Our results open up opportunities for exotic valleytronics and quantum information processing applications.

UR - http://www.scopus.com/inward/record.url?scp=85074455295&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.100.161404

DO - 10.1103/PhysRevB.100.161404

M3 - Article

VL - 100

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 16

M1 - 161404

ER -

ID: 38540715