Holler, Johannes and Selig, Malte and Kempf, Michael and Zipfel, Jonas and Nagler, Philipp and Katzer, Manuel and Katsch, Florian and Ballottin, Mariana and Mitioglu, Anatolie A. and Chernikov, Alexey and Christianen, Peter C. M. and Schueller, Christian and Knorr, Andreas and Korn, Tobias (2022) Interlayer exciton valley polarization dynamics in large magnetic fields. PHYSICAL REVIEW B, 105 (8): 085303. ISSN 2469-9950, 2469-9969
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In van der Waals heterostructures consisting of stacked MoSe2 and WSe2 monolayers, optically bright interlayer excitons can be observed when the constituent layers are crystallographically aligned. The symmetry of the monolayers allows for two different types of alignment, in which the momentum-direct interlayer transitions are either valley conserving (R-type alignment) or change the valley index (H-type antialignment). Here, we study the valley polarization dynamics of interlayer excitons in magnetic fields up to 30 T by time-resolved photoluminescence. For all interlayer exciton types, we find a finite initial photoluminescence circular degree of polarization after unpolarized excitation in applied magnetic fields. For interlayer excitons in H-type heterostructures, we observe a systematic increase of the photoluminescence circular degree of polarization with time in applied magnetic fields, which saturates at values close to unity for the largest fields. By contrast, for interlayer excitons in R-type heterostructures, the photoluminescence circular degree of polarization shows a decrease and a zero crossing before saturating with opposite polarization. This unintuitive behavior can be explained by a model considering the different interlayer exciton states in H- and R-type heterostructures and their selection rules coupling photoluminescence helicity and valley polarization.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HETEROSTRUCTURES; LAYER; MOS2; WS2; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Feb 2024 09:30 |
| Last Modified: | 02 Feb 2024 09:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58260 |
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