| SPECIAL TOPIC — Moiré physics in two-dimensional materials |
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Valley-selective manipulation of moiré excitons through optical Stark effect |
| Chenran Xu(徐晨燃)1,2,†, Jichen Zhou(周纪晨)1,2, Zhexu Shan(单哲旭)1,2, Wenjian Su(苏文健)1,2, Kenji Watanabe3, Takashi Taniguchi4, Dawei Wang(王大伟)1,2, and Yanhao Tang(汤衍浩)1,2 |
1 School of Physics, Zhejiang University, Hangzhou 310027, China;
2 Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou 310027, China;
3 Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;
4 Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan |
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Abstract Semiconductor moiré superlattices provide great platforms for exploring exotic collective excitations. Optical Stark effect, a shift of the electronic transition in the presence of a light field, provides an ultrafast and coherent method of manipulating matter states, which, however, has not been demonstrated in moiré materials. Here, we report the valley-selective optical Stark effect of moiré excitons in the WSe$_{2}$/WS$_{2}$ superlattice by using transient reflection spectroscopy. Prominent valley-selective energy shifts up to 7.8 meV have been observed for moiré excitons, corresponding to pseudo-magnetic fields as large as 34 T. Our results provide a route to coherently manipulate exotic states in moiré superlattices.
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Received: 28 August 2024
Revised: 03 September 2024
Accepted manuscript online: 18 September 2024
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PACS:
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71.35.-y
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(Excitons and related phenomena)
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42.50.Md
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(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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| Fund: Project supported by the National Key R&D Program of China (Grant Nos. 2022YFA1402400 and 2022YFA1405400), the National Natural Science Foundation of China (Grant Nos. 11934011 and 12274365), Zhejiang Provincial Natural Science Foundation of China (Grant No. LR24A040001), and Open project of Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) of Shanghai Jiao Tong University. K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Nos. 20H00354 and 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan. |
Corresponding Authors:
Chenran Xu
E-mail: crxu@zju.edu.cn
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Cite this article:
Chenran Xu(徐晨燃), Jichen Zhou(周纪晨), Zhexu Shan(单哲旭), Wenjian Su(苏文健), Kenji Watanabe, Takashi Taniguchi, Dawei Wang(王大伟), and Yanhao Tang(汤衍浩) Valley-selective manipulation of moiré excitons through optical Stark effect 2025 Chin. Phys. B 34 017102
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