Holler, Johannes and Selig, Malte and Smirnov, Dmitry S. and Kempf, Michael and Zipfel, Jonas and Nagler, Philipp and Katzer, Manuel and Katsch, Florian and Ballottin, Mariana V. and Mitioglu, Anatolie A. and Chernikov, Alexey and Christianen, Peter C. M. and Schueller, Christian and Knorr, Andreas and Korn, Tobias (2025) Magneto-Spectroscopy of Interlayer Excitons in Transition-Metal Dichalcogenide Heterostructures. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 262 (3). ISSN 0370-1972, 1521-3951
Full text not available from this repository. (Request a copy)Abstract
Transition-metal dichalcogenide (TMD) monolayers are direct-gap semiconductors with peculiar spin-valley coupling. Combining two different TMDs can lead to a type-II band alignment and formation of interlayer excitons (ILE). In MoSe2-WSe2 heterobilayers, optically bright ILE are only observable if the interlayer twist angle is close to 0 degrees (aligned, R-type) or 60 degrees (anti-aligned, H-type). Herein, low-temperature optical spectroscopy studies of these ILE in high magnetic fields are presented. Depending on interlayer twist, ILE transitions are either valley conserving or between different valleys. This allows engineering of the ILE g factor, changing its magnitude and even its sign. Additionally, applied magnetic fields induce a valley polarization of the ILE, and its buildup can directly be observed in helicity- and time-resolved photoluminescence, with peculiar features due to the dependence of ILE optical selection rules on interlayer registry. For both, R-type and H-type structures, it is found that at 24 Tesla, the valley polarization is resonantly enhanced, even though their g factors are markedly different. This observation hints at a scattering process involving single carriers within the ILE and zone-boundary acoustic phonons. Combining two different transition-metal dichalcogenide monolayers can lead to a type-II band alignment and formation of interlayer excitons (ILE). In diselenide heterobilayers, bright ILE are observable if the interlayer twist angle is close to 0 degrees or 60 degrees. Herein, optical spectroscopy studies of ILE in high magnetic fields are presented, showing the influence of interlayer alignment on ILE valleytronic properties.image (c) 2024 WILEY-VCH GmbH
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MONOLAYER; HETEROBILAYERS; LAYER; WS2; interlayer excitons; magneto-spectroscopies; transition-metal dichalcogenides; van der Waals heterostructures |
| 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: | 31 Mar 2026 07:18 |
| Last Modified: | 31 Mar 2026 07:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/65228 |
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