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cond-mat.mes-hall2026
Singular high-harmonic transport above a quantum threshold
Yugo Onishi, Su-Yang Xu, Liang Fu
We show that Landau-Zener tunneling in a small-gap insulator produces a singular DC current--voltage relation, and correspondingly, strong high-harmonic generation in AC transport.…
cond-mat.mes-hall2026
Extending Topological Bound on Quantum Weight Beyond Symmetry-Protected Topological Phases
Yi-Chun Hung, Yugo Onishi, Hsin Lin +2
The quantum metric encodes the geometric structure of Bloch wave functions and governs a wide range of physical responses. Its Brillouin-zone integral, the quantum weight, appears…