Perea-Causin, Raul and Brem, Samuel and Rosati, Roberto and Jago, Roland and Kulig, Marvin and Ziegler, Jonas D. and Zipfel, Jonas and Chernikov, Alexey and Malic, Ermin (2019) Exciton Propagation and Halo Formation in Two-Dimensional Materials. NANO LETTERS, 19 (10). pp. 7317-7323. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
The interplay of optics, dynamics, and transport is crucial for the design of novel optoelectronic devices, such as photodetectors and solar cells. In this context, transition-metal dichalcogenides (TMDs) have received much attention. Here, strongly bound excitons dominate optical excitation, carrier dynamics, and diffusion processes. While the first two have been intensively studied, there is a lack of fundamental understanding of nonequilibrium phenomena associated with exciton transport that is of central importance (e.g., for high-efficiency light harvesting). In this work, we provide microscopic insights into the interplay of exciton propagation and many-particle interactions in TMDs. On the basis of a fully quantum mechanical approach and in excellent agreement with photoluminescence measurements, we show that Auger recombination and emission of hot phonons act as a heating mechanism giving rise to strong spatial gradients in excitonic temperature. The resulting thermal drift leads to an unconventional exciton diffusion characterized by spatial exciton halos.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MONOLAYER; exciton diffusion; halos; Auger scattering; hot phonons |
| 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: | 30 Mar 2020 06:02 |
| Last Modified: | 30 Mar 2020 06:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26118 |
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