Volmer, Frank and Ersfeld, Manfred and Faria Junior, Paulo E. and Waldecker, Lutz and Parashar, Bharti and Rathmann, Lars and Dubey, Sudipta and Cojocariu, Iulia and Feyer, Vitaliy and Watanabe, Kenji and Taniguchi, Takashi and Schneider, Claus M. and Plucinski, Lukasz and Stampfer, Christoph and Fabian, Jaroslav and Beschoten, Bernd (2023) Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe₂/MoSe₂heterobilayers. NPJ 2D MATERIALS AND APPLICATIONS, 7 (1): 58. ISSN 2397-7132
Full text not available from this repository. (Request a copy)Abstract
Transition metal dichalcogenides (TMDs) have attracted much attention in the fields of valley- and spintronics due to their property of forming valley-polarized excitons when illuminated by circularly polarized light. In TMD-heterostructures it was shown that these electron-hole pairs can scatter into valley-polarized interlayer exciton states, which exhibit long lifetimes and a twist-angle dependence. However, the question how to create a valley polarization of free charge carriers in these heterostructures after a valley selective optical excitation is unexplored, despite its relevance for opto-electronic devices. Here, we identify an interlayer transfer mechanism in twisted WSe2/MoSe2 heterobilayers that transfers the valley polarization from excitons in WSe2 to free charge carriers in MoSe2 with valley lifetimes of up to 12 ns. This mechanism is most efficient at large twist angles, whereas the valley lifetimes of free charge carriers are surprisingly short for small twist angles, despite the occurrence of interlayer excitons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BANDGAP RENORMALIZATION; ELECTRICAL CONTROL; MONOLAYER MOS2; SPIN; DYNAMICS; GENERATION; COHERENCE; MOMENTUM; WS2 |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Apr 2024 05:23 |
| Last Modified: | 05 Apr 2024 05:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60742 |
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