期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-07935-y
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资金
- Israel Science Foundation [1802/12, 1781/18]
- Israeli Center of Research Excellence Circle of Light - I-CORE Program of the Planning and Budgeting Committee
- joint UGC-ISF Research Grant Program [1903/14]
- Wolfson foundation
- National Science Foundation through Harvard-Smithsonian Center for Astrophysics
- Adams Fellowship Program of the Israel Academy of Sciences and Humanities
Symmetry is one of the most generic and useful concepts in science, often leading to conservation laws and selection rules. Here we formulate a general group theory for dynamical symmetries (DSs) in time-periodic Floquet systems, and derive their correspondence to observable selection rules. We apply the theory to harmonic generation, deriving closed-form tables linking DSs of the driving laser and medium (gas, liquid, or solid) in (2+1) D and (3+1) D geometries to the allowed and forbidden harmonic orders and their polarizations. We identify symmetries, including time-reversal-based, reflection-based, and elliptical-based DSs, which lead to selection rules that are not explained by currently known conservation laws. We expect the theory to be useful for ultrafast high harmonic symmetry-breaking spectroscopy, as well as in various other systems such as Floquet topological insulators.
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