Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon

Li, Zhipeng; Wang, Tianmeng; Jin, Chenhao; Lu, Zhengguang; Lian, Zhen; Meng, Yuze; Blei, Mark; Gao, Mengnan; Taniguchi, Takashi; Watanabe, Kenji; Ren, Tianhui; Cao, Ting; Tongay, Sefaattin; Smirnov, Dmitry; Zhang, Lifa; Shi, Su-Fei

doi:10.1021/acsnano.9b06682

Title: Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon

Journal Article · Mon Nov 25 00:00:00 EST 2019 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.9b06682· OSTI ID:1800507

^[1]; Wang, Tianmeng ^[2]; Jin, Chenhao ^[3]; Lu, Zhengguang ^[4]; Lian, Zhen ^[2]; Meng, Yuze ^[5]; Blei, Mark ^[6]; Gao, Mengnan ^[7]; Taniguchi, Takashi ^[8]; Watanabe, Kenji ^[8];

^[9];

^[10];

^[6];

^[4];

^[7];

^[2]

Rensselaer Polytechnic Inst., Troy, NY (United States); Shanghai Jiao Tong Univ. (China)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Cornell Univ., Ithaca, NY (United States). Kavli Institute for Nanoscale Science
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Rensselaer Polytechnic Inst., Troy, NY (United States); Nanjing Univ. (China)
Arizona State Univ., Tempe, AZ (United States)
Nanjing Normal University (China)
National Institute for Materials Science, Tsukuba (Japan)
Shanghai Jiao Tong Univ. (China)
Univ. of Washington, Seattle, WA (United States); Stanford Univ., CA (United States)

Inversion symmetry breaking and 3-fold rotation symmetry grant the valley degree of freedom to the robust exciton in monolayer transition-metal dichalcogenides, which can be exploited for valleytronics applications. However, the short lifetime of the exciton significantly constrains the possible applications. In contrast, the dark exciton could be long-lived but does not necessarily possess the valley degree of freedom. In this work, we report the identification of the momentum-dark, intervalley exciton in monolayer WSe₂ through low-temperature magneto-photoluminescence spectra. Interestingly, the intervalley exciton is brightened through the emission of a chiral phonon at the corners of the Brillouin zone (K point), and the pseudoangular momentum of the phonon is transferred to the emitted photon to preserve the valley information. The chiral phonon energy is determined to be ~23 meV, based on the experimentally extracted exchange interaction (~7 meV), in excellent agreement with the theoretical expectation of 24.6 meV. The long-lived intervalley exciton with valley degree of freedom adds an exciting quasiparticle for valleytronics, and the coupling between the chiral phonon and intervalley exciton furnishes a venue for valley spin manipulation.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46451

OSTI ID:: 1800507

Journal Information:: ACS Nano, Vol. 13, Issue 12; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon

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