30 citations · 158 across the 12 of their papers we have counts for
12 papers
Quantum-geometry-driven exact ferromagnetic ground state in a nearly flat band
Taisei Kitamura, Hiroki Nakai, Hosho Katsura +1
We construct a Hubbard model with a nearly flat band whose quantum geometry can be tuned independently of the energy dispersion and the Coulomb interaction. We show that, when the…
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…
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…
Anomalous Temperature Dependence of Quantum-Geometric Superfluid Weight
Yuma Hirobe, Taisei Kitamura, Youichi Yanase
The symmetry of Cooper pairs encodes key information about superconductivity and has been widely studied through the temperature dependence of the superfluid weight. However, in sy…
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 geometry encoded to pair potentials
Akito Daido, Taisei Kitamura, Youichi Yanase
Bloch wave functions of electrons have properties called quantum geometry, which has recently attracted much attention as the origin of intriguing physical phenomena. In this paper…
Spin-triplet superconductivity from quantum-geometry-induced ferromagnetic fluctuation
Taisei Kitamura, Akito Daido, Youichi Yanase
We show that quantum geometry induces ferromagnetic fluctuation resulting in spin-triplet superconductivity. The criterion for ferromagnetic fluctuation is clarified by analyzing c…
Piezoelectric effect and diode effect in anapole and monopole superconductors
Michiya Chazono, Shota Kanasugi, Taisei Kitamura +1
Superconductors lacking both inversion symmetry and time-reversal symmetry have been attracting much attention as a platform for exotic superconducting phases and anomalous phenome…
Quantum-geometry-induced anapole superconductivity
Taisei Kitamura, Shota Kanasugi, Michiya Chazono +1
Anapole superconductivity recently proposed for multiband superconductors Commun. Phys. , 39\ (2022) (at https://www.nature.com/articles/s42005-022-00804-7) is a key feature…
Quantum geometric effect on Fulde-Ferrell-Larkin-Ovchinnikov superconductivity
Taisei Kitamura, Akito Daido, Youichi Yanase
Quantum geometry characterizes the geometric properties of Bloch electrons in the wave space, represented by the quantum metric and the Berry curvature. Recent studies have reveale…
Superconductivity in monolayer FeSe enhanced by quantum geometry
Taisei Kitamura, Tatsuya Yamashita, Jun Ishizuka +2
We formulate the superfluid weight in unconventional superconductors with -dependent Cooper pair potentials based on the geometric properties of Bloch electrons. We apply th…
Thermodynamic electric quadrupole moments of nematic phases from first-principles calculation
Taisei Kitamura, Jun Ishizuka, Akito Daido +1
The electronic nematic phase emerging with spontaneous rotation symmetry breaking is a central issue of modern condensed matter physics. In particular, various nematic phases in ir…