Herrmann, Paul and Klimmer, Sebastian and Lettau, Thomas and Weickhardt, Till and Papavasileiou, Anastasios and Mosina, Kseniia and Sofer, Zdenek and Paradisanos, Ioannis and Kartashov, Daniil and Wilhelm, Jan and Soavi, Giancarlo (2025) Nonlinear valley selection rules and all-optical probe of broken time-reversal symmetry in monolayer WSe2. NATURE PHOTONICS, 19 (3). pp. 300-306. ISSN 1749-4885, 1749-4893
Full text not available from this repository. (Request a copy)Abstract
In monolayer transition metal dichalcogenides, time-reversal symmetry-combined with broken space-inversion symmetry-defines the spin-valley degree of freedom. As such, the engineering and control of time-reversal symmetry by optical or magnetic fields constitutes the foundation of valleytronics. Here we propose a new approach for the detection of broken time-reversal symmetry and valley imbalance in monolayer WSe2 based on second-harmonic generation. At room temperature, our method can selectively probe a net valley imbalance generated by ultrafast, coherent and valley-exclusive optical Stark and Bloch-Siegert effects. This work demonstrates the potential and unique capabilities of nonlinear optics as a probe of broken time-reversal symmetry as well as a tool for ultrafast and non-destructive valleytronic operations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENERATION; MOS2; POLARIZATION; EXCITONS; SPIN |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Regensburg Center for UltrafastNanoscopy (RUN) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jun 2026 06:28 |
| Last Modified: | 24 Jun 2026 06:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66914 |
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