Zipfel, Jonas and Kulig, Marvin and Perea-Causin, Raul and Brem, Samuel and Ziegler, Jonas D. and Rosati, Roberto and Taniguchi, Takashi and Watanabe, Kenji and Glazov, Mikhail M. and Malic, Ermin and Chernikov, Alexey (2020) Exciton diffusion in monolayer semiconductors with suppressed disorder. PHYSICAL REVIEW B, 101 (11): 115430. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
Tightly bound excitons in monolayer semiconductors represent a versatile platform to study two-dimensional propagation of neutral quasiparticles. Their intrinsic properties, however, can be severely obscured by spatial energy fluctuations due to a high sensitivity to the immediate environment. Here, we take advantage of the encapsulation of individual layers in hexagonal boron nitride to strongly suppress environmental disorder. Diffusion of excitons is then directly monitored using time and spatially resolved emission microscopy at ambient conditions. We consistently find very efficient propagation with linear diffusion coefficients up to 10 cm(2)/s, corresponding to room-temperature effective mobilities as high as 400 cm(2)/Vs as well as a correlation between rapid diffusion and short population lifetime. At elevated densities we detect distinct signatures of many-particle interactions and consequences of strongly suppressed Auger-type exciton-exciton annihilation. A combination of analytical and numerical theoretical approaches is employed to provide pathways toward comprehensive understanding of the observed linear and nonlinear propagation phenomena. We emphasize the role of dark exciton states and present a mechanism for diffusion facilitated by free-electron hole plasma from entropy-ionized excitons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION; PHOTOLUMINESCENCE; IONIZATION; TRANSPORT; DYNAMICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Junior Research Group Alexey Chernikov |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Mar 2021 07:06 |
| Last Modified: | 29 Mar 2021 07:06 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44885 |
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