Gate Tunable Dark Trions in Monolayer WSe2

Liu, Erfu; van Baren, Jeremiah; Lu, Zhengguang; Altaiary, Mashael M.; Taniguchi, Takashi; Watanabe, Kenji; Smirnov, Dmitry; Lui, Chun Hung

doi:10.1103/physrevlett.123.027401

Title: Gate Tunable Dark Trions in Monolayer WSe₂

Journal Article · Tue Jul 09 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.123.027401· OSTI ID:1609905

^[1]; van Baren, Jeremiah ^[1]; Lu, Zhengguang ^[2]; Altaiary, Mashael M. ^[1]; Taniguchi, Takashi ^[3]; Watanabe, Kenji ^[3]; Smirnov, Dmitry ^[4]; Lui, Chun Hung ^[1]

Univ. of California, Riverside, CA (United States)
National High Magnetic Field Lab., Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
National Inst. for Materials Science, Ibaraki (Japan)
National High Magnetic Field Lab., Tallahassee, FL (United States)

Monolayer WSe₂ is an intriguing material to explore dark exciton physics. We have measured the photoluminescence from dark excitons and trions in ultraclean monolayer WSe₂ devices encapsulated by boron nitride. The dark trions can be tuned continuously between negative and positive trions with electrostatic gating. We reveal their spin-triplet configuration and distinct valley optical emission by their characteristic Zeeman splitting under a magnetic field. Here, the dark trion binding energies are 14–16 meV, slightly lower than the bright trion binding energies (21–35 meV). The dark trion lifetime (~1.3 ns) is two orders of magnitude longer than the bright trion lifetime (~10 ps) and can be tuned between 0.4 and 1.3 ns by gating. Such robust, optically detectable, and gate tunable dark trions may help us realize trion transport in two-dimensional materials.

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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:: 1609905

Alternate ID(s):: OSTI ID: 1546287

Journal Information:: Physical Review Letters, Vol. 123, Issue 2; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 75 works

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Title: Gate Tunable Dark Trions in Monolayer WSe2

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Title: Gate Tunable Dark Trions in Monolayer WSe₂