Deb, Swarup and Krause, Johannes and Faria Junior, Paulo E. and Kempf, Michael Andreas and Schwartz, Rico and Watanabe, Kenji and Taniguchi, Takashi and Fabian, Jaroslav and Korn, Tobias (2024) Excitonic signatures of ferroelectric order in parallel-stacked MoS2. NATURE COMMUNICATIONS, 15 (1): 7595. ISSN 2041-1723
Full text not available from this repository. (Request a copy)Abstract
Interfacial ferroelectricity, prevalent in various parallel-stacked layered materials, allows switching of out-of-plane ferroelectric order by in-plane sliding of adjacent layers. Its resilience against doping potentially enables next-generation storage and logic devices. However, studies have been limited to indirect sensing or visualization of ferroelectricity. For transition metal dichalcogenides, there is little knowledge about the influence of ferroelectric order on their intrinsic valley and excitonic properties. Here, we report direct probing of ferroelectricity in few-layer 3R-MoS2 using reflectance contrast spectroscopy. Contrary to a simple electrostatic perception, layer-hybridized excitons with out-of-plane electric dipole moment remain decoupled from ferroelectric ordering, while intralayer excitons with in-plane dipole orientation are sensitive to it. Ab initio calculations identify stacking-specific interlayer hybridization leading to this asymmetric response. Exploiting this sensitivity, we demonstrate optical readout and control of multi-state polarization with hysteretic switching in a field-effect device. Time-resolved Kerr ellipticity reveals direct correspondence between spin-valley dynamics and stacking order.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jan 2026 10:37 |
| Last Modified: | 27 Jan 2026 10:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64856 |
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