Hauptseite > Publikationsdatenbank > Unveiling Valley Lifetimes of Free Charge Carriers in Monolayer WSe 2 > print

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024 7 _ |a 10.1021/acs.nanolett.9b05138
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100 1 _ |a Ersfeld, Manfred
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245 _ _ |a Unveiling Valley Lifetimes of Free Charge Carriers in Monolayer WSe 2
260 _ _ |a Washington, DC
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520 _ _ |a We report on nanosecond-long, gate-dependent valley lifetimes of free charge carriers in monolayer WSe2, unambiguously identified by the combination of time-resolved Kerr rotation and electrical transport measurements. While the valley polarization increases when tuning the Fermi level into the conduction or valence band, there is a strong decrease of the respective valley lifetime consistent with both electron-phonon and spin-orbit scattering. The longest lifetimes are seen for spin-polarized bound excitons in the band gap region. We explain our findings via two distinct, Fermi-level-dependent scattering channels of optically excited, valley-polarized bright trions either via dark or bound states. By electrostatic gating we demonstrate that the transition-metal dichalcogenide WSe2 can be tuned to be either an ideal host for long-lived localized spin states or allow for nanosecond valley lifetimes of free charge carriers (>10 ns).
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700 1 _ |a Volmer, Frank
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700 1 _ |a Rathmann, Lars
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700 1 _ |a Kotewitz, Luca
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700 1 _ |a Heithoff, Maximilian
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700 1 _ |a Lohmann, Mark
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700 1 _ |a Yang, Bowen
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700 1 _ |a Watanabe, Kenji
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700 1 _ |a Taniguchi, Takashi
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700 1 _ |a Bartels, Ludwig
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700 1 _ |a Shi, Jing
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700 1 _ |a Stampfer, Christoph
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700 1 _ |a Beschoten, Bernd
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773 _ _ |a 10.1021/acs.nanolett.9b05138
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856 4 _ |u https://juser.fz-juelich.de/record/877335/files/acs.nanolett.9b05138-1.pdf
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