The dc-current-induced optical second-harmonic generation is observed at the surface of centrosymmetric single crystal of Si. Surface dc-current with density up to $\textit{j}_{max} \sim 10^{3}$ A/cm$^{2}$ results in break of inversion symmetry of Si and induces optical second-harmonic generation with intensity that corresponds to the appearance of dipole second-order susceptibility $χ^{(2)d}(j_{max})\sim 3 \cdot 10^{-15}$m/V.
Symmetry breaking by quantum light in solid-state high-harmonic generation
ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology（ICFO-光子科学研究所，巴塞罗那科技研究院）；Atominstitut, Technische Universität Wien（原子物理研究所，维也纳工业大学）；Department of Physics and Astronomy, University College London（伦敦大学学院物理与天文系）；Department of Materials Science and Engineering, Pohang University of Science and Technology（浦项科技大学材料科学与工程系）；Departamento de Física, Área de Física, Universidad de Panamá（巴拿马大学物理系）；Sistema Nacional de Investigación de Panamá（巴拿马国家研究系统）；Centro de Investigación con Técnicas Nucleares, Universidad de Panamá（巴拿马大学核技术研究中心）；Parque Científico y Tecnológico, Universidad Autónoma de Chiriquí（奇里基自治大学科技园）；Eastern Institute of Technology（东方理工学院）
Revealing Hidden Inversion Symmetry Breaking in ZrTe$_5$ via Phonon-Assisted Heterodyne Amplification
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；International Center for Quantum Materials, School of Physics, Peking University（北京大学物理学院量子材料中心）；Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交通大学汤川研究所）；Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University（上海交通大学张江高等研究院）
Fluctuation-induced symmetry breaking in high harmonic generation for bicircular quantum light
ICFO—Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology（ICFO-光子科学研究所，巴塞罗那科学技术研究所）；Atominstitut, Technische Universität Wien（原子物理研究所，维也纳工业大学）；Eastern Institute of Technology（东部理工学院）；Department of Physics and Astronomy, University College London（伦敦大学学院物理与天文系）
Multipolar Light-Matter Hamiltonians in Symmetry-Breaking Photonic Vacuums
Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交大李政道研究所）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；Shanghai Branch, Hefei National Laboratory（合肥国家实验室上海分部）
