Lin, Kai-Qiang and Faria Jr, Paulo E. and Huebner, Ruven and Ziegler, Jonas D. and Bauer, Jonas M. and Buchner, Fabian and Florian, Matthias and Hofmann, Felix and Watanabe, Kenji and Taniguchi, Takashi and Fabian, Jaroslav and Steinhoff, Alexander and Chernikov, Alexey and Bange, Sebastian and Lupton, John M. (2023) Ultraviolet interlayer excitons in bilayer WSe<sub>2</sub>. NATURE PORTFOLIO, BERLIN.
Full text not available from this repository. (Request a copy)Abstract
Interlayer excitons in van der Waals heterostructures are fascinating for applications like exciton condensation, excitonic devices and moire-induced quantum emitters. The study of these charge-transfer states has almost exclusively focused on band edges, limiting the spectral region to the near-infrared regime. Here we explore the above-gap analogues of interlayer excitons in bilayer WSe2 and identify both neutral and charged species emitting in the ultraviolet. Even though the transitions occur far above the band edge, the states remain metastable, exhibiting linewidths as narrow as 1.8 meV. These interlayer high-lying excitations have switchable dipole orientations and hence show prominent Stark splitting. The positive and negative interlayer high-lying trions exhibit significant binding energies of 20-30 meV, allowing for a broad tunability of transitions via electric fields and electrostatic doping. The Stark splitting of these trions serves as a highly accurate, built-in sensor for measuring interlayer electric field strengths, which are exceedingly difficult to quantify otherwise. Such excitonic complexes are further sensitive to the interlayer twist angle and offer opportunities to explore emergent moire physics under electrical control. Our findings more than double the accessible energy range for applications based on interlayer excitons.
| Item Type: | Other |
|---|---|
| Uncontrolled Keywords: | TRIONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Apr 2024 13:29 |
| Last Modified: | 23 Apr 2024 13:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60173 |
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