Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe 2

Li, Zhipeng; Wang, Tianmeng; Lu, Zhengguang; Khatoniar, Mandeep; Lian, Zhen; Meng, Yuze; Blei, Mark; Taniguchi, Takashi; Watanabe, Kenji; McGill, Stephen A.; Tongay, Sefaattin; Menon, Vinod M.; Smirnov, Dmitry; Shi, Su-Fei

doi:10.1021/acs.nanolett.9b02132

Title: Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe ₂

Journal Article · Thu Sep 05 00:00:00 EDT 2019 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.9b02132· OSTI ID:1800505

Li, Zhipeng ^[1]; Wang, Tianmeng ^[1]; Lu, Zhengguang ^[2]; Khatoniar, Mandeep ^[3]; Lian, Zhen ^[1]; Meng, Yuze ^[1]; Blei, Mark ^[4]; Taniguchi, Takashi ^[5]; Watanabe, Kenji ^[5]; McGill, Stephen A. ^[2];

^[4];

^[3];

^[2];

^[1]

Rensselaer Polytechnic Inst., Troy, NY (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
City Univ. of New York (CUNY), NY (United States)
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (Japan)

Spin-forbidden intravalley dark excitons in tungsten-based transition-metal dichalcogenides (TMDCs), because of their unique spin texture and long lifetime, have attracted intense research interest. Here, we show that we can control the dark exciton electrostatically by dressing it with one free electron or free hole, forming the dark trions. The existence of the dark trions is suggested by the unique magneto-photoluminescence spectroscopy pattern of the boron nitride (BN)-encapsulated monolayer WSe₂ device at low temperature. The unambiguous evidence of the dark trions is further obtained by directly resolving the radiation pattern of the dark trions through back focal plane imaging. The dark trions possess a binding energy of ~15 meV, and they inherit the long lifetime and large g-factor from the dark exciton. Interestingly, under the out-of-plane magnetic field, dressing the dark exciton with one free electron or hole results in distinctively different valley polarization of the emitted photon, as a result of the different intervalley scattering mechanism for the electron and hole. In conclusion, the lifetime of the positive dark trion can be further tuned from ~50 ps to ~215 ps by controlling the gate voltage. The gate-tunable dark trions usher in new opportunities for excitonic optoelectronics and valleytronics.

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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:: 1800505

Journal Information:: Nano Letters, Vol. 19, Issue 10; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe 2

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Title: Direct Observation of Gate-Tunable Dark Trions in Monolayer WSe ₂