324 citations · 553 across the 20 of their papers we have counts for
21 papers
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…
Emergent curved space and gravitational lensing in quantum materials
Yugo Onishi, Nisarga Paul, Liang Fu
We show that an effective gravitational field naturally emerges in quantum materials with long-wavelength spin (or pseudospin) textures. When the itinerant electrons' spin strongly…
Geometric bound on structure factor
Yugo Onishi, Alexander Avdoshkin, Liang Fu
We show that a quadratic form of quantum geometric tensor in -space sets a bound on the term in the static structure factor at small . Bands that saturate…
Topological bound on structure factor
Yugo Onishi, Liang Fu
We show that the static structure factor of general many-body systems with symmetry has a lower bound determined only by the ground state Chern number. Our bound relies only…
An antiferromagnetic diode effect in even-layered MnBi2Te4
Anyuan Gao, Shao-Wen Chen, Barun Ghosh +26
In a PN junction, the separation between positive and negative charges leads to diode transport. In the past few years, the intrinsic diode transport in noncentrosymmetric polar co…
Quantum weight: A fundamental property of quantum many-body systems
Yugo Onishi, Liang Fu
We introduce the concept of quantum weight as a ground state property of quantum many-body systems that is encoded in the static structure factor and characterizes density fluctuat…
Quantum weight
Yugo Onishi, Liang Fu
We introduce the concept of quantum weight as a fundamental property of insulating states of matter that is encoded in the ground-state static structure and measures quantum fluctu…
Probing quantum geometry through optical conductivity and magnetic circular dichroism
Barun Ghosh, Yugo Onishi, Su-Yang Xu +3
Probing ground-state quantum geometry and topology through optical response is not only of fundamental interest, but it can also offer several practical advantages. Here, using fir…
Universal relation between energy gap and dielectric constant
Yugo Onishi, Liang Fu
We establish a universal relation between the energy gap and the static dielectric constant for all insulating states. This relation yields an upper bound on the energy gap, which…
Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
Anyuan Gao, Yu-Fei Liu, Jian-Xiang Qiu +28
Quantum geometry - the geometry of electron Bloch wavefunctions - is central to modern condensed matter physics. Due to the quantum nature, quantum geometry has two parts, the real…
Fundamental bound on topological gap
Yugo Onishi, Liang Fu
We provide a universal tight bound on the energy gap of topological insulators by exploring relationships between topology, quantum geometry, and optical absorption. Applications o…
Colossal nonreciprocal Hall effect and broadband frequency mixing due to a room temperature nonlinear Hall effect
Lujin Min, Yang Zhang, Zhijian Xie +8
Nonreciprocal (NR) charge transport in quantum materials has attracted enormous interest since it offers an avenue to investigate quantum symmetry related physics and holds many pr…
High-efficiency energy harvesting based on nonlinear Hall rectifier
Yugo Onishi, Liang Fu
Noncentrosymmetric quantum materials can convert AC input current into DC transverse current through the nonlinear Hall effect at zero magnetic field. We analyze the AC-DC power co…
Effects of relaxation on photovoltaic effect and possibility of photocurrent within transparent region
Yugo Onishi, Hikaru Watanabe, Takahiro Morimoto +1
We theoretically study photocurrents in metals that break both inversion and symmetries within the transparent region. We find that the system under the…
Theory of shift heat current and its application to electron-phonon coupled systems
Yugo Onishi, Takahiro Morimoto, Naoto Nagaosa
We propose a heat current analog of the shift current, "shift heat current". We study nonlinear heat current responses to an applied ac electric field by a diagrammatic method and…
Theory of Seebeck ratchet in noncentrosymmetric electron-phonon coupled system
Yugo Onishi, Hiroki Isobe, Naoto Nagaosa
A thermoelectric effect of the noncentrosymmetric electron-phonon coupled system is proposed, in which a temperature difference between electrons and phonons, instead of a spatial…
Theory of thermopolarization effect
Yugo Onishi, Hiroki Isobe, Atsuo Shitade +1
We study the polarization response to the temperature gradient in insulators, known as the thermopolarization effect. We show that this response can be understood through the free…
Feedback-type thermoelectric effect in correlated solids
Yugo Onishi, Naoto Nagaosa
A new thermoelectric effect mechanism inspired by an autonomous Maxwell's demon [P. Strasberg, G. Schaller, T. Brandes, and M. Esposito, Phys. Rev. Lett. 110, 040601 (2013)] is pro…