Wagner, Koloman and Zipfel, Jonas and Rosati, Roberto and Wietek, Edith and Ziegler, Jonas D. and Brem, Samuel and Perea-Causin, Raul and Taniguchi, Takashi and Watanabe, Kenji and Glazov, Mikhail M. and Malic, Ermin and Chernikov, Alexey (2021) Nonclassical Exciton Diffusion in Monolayer WSe2. PHYSICAL REVIEW LETTERS, 127 (7): 076801. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
We experimentally demonstrate time-resolved exciton propagation in a monolayer semiconductor at cryogenic temperatures. Monitoring phonon-assisted recombination of dark states, we find a highly unusual case of exciton diffusion. While at 5 K the diffusivity is intrinsically limited by acoustic phonon scattering, we observe a pronounced decrease of the diffusion coefficient with increasing temperature, far below the activation threshold of higher-energy phonon modes. This behavior corresponds neither to well-known regimes of semiclassical free-particle transport nor to the thermally activated hopping in systems with strong localization. Its origin is discussed in the framework of both microscopic numerical and semiphenomenological analytical models illustrating the observed characteristics of nonclassical propagation. Challenging the established description of mobile excitons in monolayer semiconductors, these results open up avenues to study quantum transport phenomena for excitonic quasiparticles in atomically thin van der Waals materials and their heterostructures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-WELLS; PHONON-WIND; PHOTOEXCITED CARRIERS; LOCALIZED EXCITONS; DYNAMICS; TRANSPORT; PHOTOLUMINESCENCE; RELAXATION; LINEWIDTHS; TRIONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Sep 2022 08:42 |
| Last Modified: | 14 Sep 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47425 |
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