Quantum Geometric Origin of Strain-Tunable Giant Second-Harmonic Generation in Bi${}_2$O${}_2$X (X=S, Se, Te)

Zhefeng Lou, Zhihao Gong, Ziye Zhu +3

Two-dimensional (2D) materials with giant nonlinear optical (NLO) responses are essential for the development of advanced on-chip NLO devices. Using first-principles calculations,…