11 papers
Quantum Theory of Current-Generating Local Orbital Magnetization
Akito Daido
Local orbital magnetization is the field whose rotation generates the equilibrium current density. Unlike spin magnetization, a quantum-mechanical local formula consistent with bot…
Quantum geometric ferromagnetism by singular saddle point
Taisei Kitamura, Hiroki Nakai, Akito Daido +1
We propose ferromagnetism that occurs in electrons at a saddle point with band touching, which we call the singular saddle point. At the singular saddle point, the divergent quantu…
Quantum-metric-nematicity induced Kerr-like polarization rotation without time-reversal symmetry breaking
Wenhao Liang, Akito Daido, K. T. Law
The magneto-optic Kerr effect (MOKE), which describes the rotation and ellipticity of linearly polarized light upon reflection, is conventionally associated with time-reversal symm…
Quantum geometry in correlated electron phases: from flat band to dispersive band
Taisei Kitamura, Akito Daido, Youichi Yanase
Quantum geometry, describing the geometric properties of the Bloch wave function in momentum space, has recently been recognized as a fundamental concept in condensed matter physic…
Nonreciprocal Current-Induced Zero-Resistance State in Valley-Polarized Superconductors
Akito Daido, Youichi Yanase, K. T. Law
The recently observed nonreciprocal current-induced zero-resistance state (CIZRS) in twisted trilayer graphene/WSe heterostructure has posed a significant theoretical challenge…
Magnetic phase transitions driven by quantum geometry
Chang-geun Oh, Taisei Kitamura, Akito Daido +2
We explore how the quantum geometric properties of the Bloch wave function, characterized by the Hilbert-Schmidt quantum distance, impact magnetic phases in solid-state systems. To…