Wagner, Koloman and Iakovlev, Zakhar A. and Ziegler, Jonas D. and Cuccu, Marzia and Taniguchi, Takashi and Watanabe, Kenji and Glazov, Mikhail M. and Chernikov, Alexey (2023) Diffusion of Excitons in a Two-Dimensional Fermi Sea of Free Charges. NANO LETTERS, 23 (11). pp. 4708-4715. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Propagation of light-emitting quasiparticles is of centralimportanceacross the fields of condensed matter physics and nanomaterials science.We experimentally demonstrate diffusion of excitons in the presenceof a continuously tunable Fermi sea of free charge carriers in a monolayersemiconductor. Light emission from tightly bound exciton states inelectrically gated WSe2 monolayer is detected using spatiallyand temporally resolved microscopy. The measurements reveal a nonmonotonicdependence of the exciton diffusion coefficient on the charge carrierdensity in both electron and hole doped regimes. Supported by analyticaltheory describing exciton-carrier interactions in a dissipativesystem, we identify distinct regimes of elastic scattering and quasiparticleformation determining exciton diffusion. The crossover region exhibitsa highly unusual behavior of an increasing diffusion coefficient withincreasing carrier densities. Temperature-dependent diffusion measurementsfurther reveal characteristic signatures of freely propagating excitoniccomplexes dressed by free charges with effective mobilities up to3 x 10(3) cm(2)/(V s).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRIONS; TRANSPORT; SPECTRA; MOSE2; two-dimensional semiconductors; excitons; trions; Fermi polarons; diffusion; scattering |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Junior Research Group Alexey Chernikov |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Mar 2024 10:26 |
| Last Modified: | 14 Mar 2024 10:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60066 |
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