Nagler, Philipp and Plechinger, Gerd and Ballottin, Mariana V. and Mitioglu, Anatolie and Meier, Sebastian and Paradiso, Nicola and Strunk, Christoph and Chernikov, Alexey and Christianen, Peter C. M. and Schueller, Christian and Korn, Tobias (2017) Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure. 2D MATERIALS, 4 (2): 025112. ISSN 2053-1583,
Full text not available from this repository. (Request a copy)Abstract
In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically generated electron-hole pairs into opposite monolayers. These spatially separated electron-hole pairs are Coulomb-coupled and form interlayer excitons. Here, we study these interlayer excitons in a heterostructure consisting of MoSe2 and WSe2 monolayers using photoluminescence spectroscopy. We observe a non-trivial temperature dependence of the linewidth and the peak energy of the interlayer exciton, including an unusually strong initial redshift of the transition with temperature, as well as a pronounced blueshift of the emission energy with increasing excitation power. By combining these observations with time-resolved photoluminescence measurements, we are able to explain the observed behavior as a combination of interlayer exciton diffusion and dipolar, repulsive exciton-exciton interaction.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; DER-WAALS HETEROSTRUCTURES; QUANTUM-WELLS; OPTICAL SPECTROSCOPY; SEMICONDUCTOR; WSE2; TEMPERATURE; COHERENCE; GRAPHENE; SPIN; transition-metal dichalcogenides; heterostructures; interlayer excitons |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 28 Feb 2019 10:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/783 |
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