Hao, Kai and Specht, Judith F. and Nagler, Philipp and Xu, Lixiang and Tran, Kha and Singh, Akshay and Dass, Chandriker Kavir and Schueller, Christian and Korn, Tobias and Richter, Marten and Knorr, Andreas and Li, Xiaoqin and Moody, Galan (2017) Neutral and charged inter-valley biexcitons in monolayer MoSe2. NATURE COMMUNICATIONS, 8: 15552. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including excitons and trions, that dominate the optical properties. Higher-order states, such as bound biexcitons, are possible but are difficult to identify unambiguously using linear optical spectroscopy methods. Here, we implement polarization-resolved two-dimensional coherent spectroscopy (2DCS) to unravel the complex optical response of monolayer MoSe2 and identify multiple higher-order correlated states. Decisive signatures of neutral and charged inter-valley biexcitons appear in cross-polarized two-dimensional spectra as distinct resonances with respective similar to 20 and similar to 5meV binding energies-similar to recent calculations using variational and Monte Carlo methods. A theoretical model considering the valley-dependent optical selection rules reveals the quantum pathways that give rise to these states. Inter-valley biexcitons identified here, comprising of neutral and charged excitons from different valleys, offer new opportunities for developing ultrathin biexciton lasers and polarization-entangled photon sources.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; FOURIER-TRANSFORM SPECTROSCOPY; EXCITON BINDING-ENERGY; QUANTUM-WELLS; MANY-BODY; SEMICONDUCTOR; COHERENT; WS2; PHOTOLUMINESCENCE; DYNAMICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 25 Feb 2019 14:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1663 |
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