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cond-mat.str-el2026
Nonperturbative effects in second harmonic generation
Keisuke Kitayama, Masao Ogata
Second-harmonic generation (SHG) is a quintessential probe of inversion symmetry breaking in condensed matter. While perturbative processes are well-documented, the nonpe…
cond-mat.mes-hall2026
Predicted DC current induced by propagating wave in gapless Dirac materials
Keisuke Kitayama, Masao Ogata
In this paper, we show that the application of propagating waves can induce a DC current even in systems with spatial inversion symmetry. We derive the equation for the DC current…