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Nonlinear Optical Response in Kagome Lattice with Inversion Symmetry Breaking
Xiangyang Liu1,2, Junwen Lai1,2, Jie Zhan1,2
1School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China.
Abstract:
The kagome lattice is a fundamental model structure in condensed matter physics and materials science featuring symmetry-protected flat bands, saddle points, and Dirac points. This structure has emerged as an ideal platform for exploring various quantum physics. By combining effective model analysis and first-principles calculations, we propose that the synergy among inversion symmetry breaking, flat bands, and saddle point-related van Hove singularities within the kagome lattice holds significant potential for generating the strong second-order nonlinear optical response. This property provides an inspiring insight into the practical application of the kagome-like materials, which is helpful for a comprehensive understanding of kagome lattice-related physics. Moreover, this work offers an alternative approach for designing materials with a strong second-order nonlinear optical response.
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