期刊
SCIENCE
卷 372, 期 6537, 页码 68-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz9146
关键词
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资金
- JSPS [JP19H05602]
- A3 Foresight Program [JP19K21843, JP20H05264, JP19H01819]
- JST PRESTO [JPMJPR19L1, JPMJPR19L9]
- JST CREST [JPMJCR19T3]
- Materials Education program for the future leaders in Research, Industry, and Technology (MERIT)
- Nakatani RIES program
- National Natural Science Foundation of China [91750101, 51861145201, 52072168, 21733001]
- National Key Basic Research Program of the Ministry of Science and Technology of China [2018YFA0306200]
- Fundamental Research Funds for the Central Universities [021314380078, 021314380104, 021314380147]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [021314416201]
- Jiangsu Key Laboratory of Artificial Functional Materials
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
- New Frontiers in Research Fund
- Canada First Research Excellence Fund
- Max Planck-UBC-UTokyo Centre for Quantum Materials
- Canada Research Chairs Program
- Advanced Leading Graduate Course for Photon Science (ALPS)
- [JP17J08941]
- [JP17J09152]
Van der Waals interfaces can be formed by layer stacking without consideration of lattice constants or symmetries of individual building blocks. By engineering the symmetry of a van der Waals interface between tungsten selenide and black phosphorus, researchers observed a spontaneous photovoltaic effect resulting from in-plane electronic polarization.
Van der Waals interfaces can be formed by layer stacking without regard to lattice constants or symmetries of individual building blocks. We engineered the symmetry of a van der Waals interface of tungsten selenide and black phosphorus and realized in-plane electronic polarization that led to the emergence of a spontaneous photovoltaic effect. Spontaneous photocurrent was observed along the polar direction and was absent in the direction perpendicular to it. The observed spontaneous photocurrent was explained by a quantum-mechanical shift current that reflects the geometrical and topological electronic nature of this emergent interface. The present results offer a simple guideline for symmetry engineering that is applicable to a variety of van der Waals interfaces.
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