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Quantization through dissipation: impurity states and the optical quantum Hall effect
Zhenisbek Tagay, Ahmed Abouelkomsan, Yugo Onishi +4
The integer quantum Hall effect remains the most paradigmatic and remarkable example of exact quantization in condensed matter physics. Its Hall conductivity is fixed to $…
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.…
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…
Revealing quantum geometry of solids through vacuum fluctuations
Yugo Onishi, Liang Fu
We show that quantum fluctuations of electromagnetic fields induce an extensive zero-point energy in insulators. The zero-point energy density is proportional to the quantum fluctu…