13 citations · 33 across the 11 of their papers we have counts for
12 papers
Localized states of the non-Hermitian Schr{ö}dinger equation with a complex potential: from Efimov states to bipolarons
Kyoka Tsunoda, Kazuki Yamamoto, Shimpei Endo
We study the non-Hermitian Schrödinger equation with a complex potential, which bridges Hermitian few-body and non-Hermitian many-body physics: a real attractive potentia…
Efficiency of Continuous-Time Quantum Monte Carlo Updates in the Ferromagnetic State of the Doped SU(3) Fermi-Hubbard Model
Juntaro Fujii, Kazuki Yamamoto, Akihisa Koga
We investigate the sampling efficiency in a segment-based continuous-time hybridization-expansion quantum Monte Carlo solver within dynamical mean-field theory for the doped SU(3)…
Impact of Stealthy Hyperuniform Magnetic Impurity Configurations on Bulk Magnetism in a Two-dimensional Heisenberg Model
K. Asakura, K. Yamamoto, A. Koga
We investigate an antiferromagnetic quantum Heisenberg model on a square lattice with high-spin magnetic impurities to clarify how random and stealthy hyperuniform impurity configu…
Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU() Fermi-Hubbard model
Juntaro Fujii, Kazuki Yamamoto, Akihisa Koga
We study the ferromagnetic instability in an SU() Fermi-Hubbard model on the hypercubic lattice. Combining dynamical mean-field theory with continuous-time quantum Monte Carlo s…
Elliptical-rod geometries enhance photonic band gaps in disordered stealthy hyperuniform photonic crystals
Kota Asakura, Kazuki Yamamoto, Akihisa Koga
We study two-dimensional photonic crystals composed of elliptical dielectric rods arranged according to stealthy hyperuniform point patterns. These patterns are characterized by th…
Kondo breakdown induced by non-Hermitian complex hybridization
Kazuki Yamamoto, Masaya Nakagawa, Norio Kawakami
Recently, a non-Hermitian Anderson impurity model with one-body loss has been studied in [Phys. Rev. B 111, 125157 (2025)}], and it has been demonstrated that the renormalization e…
Dimensionality effect on exceptional fermionic superfluidity with spin-dependent asymmetric hopping
Soma Takemori, Kazuki Yamamoto, Akihisa Koga
Non-Hermitian (NH) quantum systems host exceptional points (EPs), where eigenstates and eigenvalues coalesce, leading to unconventional many-body phenomena absent in Hermitian syst…
Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A dynamical mean-field theory study
Juntaro Fujii, Kazuki Yamamoto, Akihisa Koga
We investigate an SU(3) Fermi-Hubbard model on a hypercubic lattice at finite temperatures, combining dynamical mean-field theory with continuous-time quantum Monte Carlo simulatio…
Spin-Depairing-Induced Exceptional Fermionic Superfluidity
Soma Takemori, Kazuki Yamamoto, Akihisa Koga
We investigate the non-Hermitian (NH) attractive Hubbard model with spin depairing, which is a spin-resolved asymmetric hopping that nonreciprocally operates spins in the opposite…
Correlation versus dissipation in a non-Hermitian Anderson impurity model
Kazuki Yamamoto, Masaya Nakagawa, Norio Kawakami
We analyze the competition between strong correlations and dissipation in quantum impurity systems from the Kondo regime to the valence fluctuation regime by developing a slave-bos…
Phase diagram of non-Hermitian BCS superfluids in a dissipative asymmetric Hubbard model
Soma Takemori, Kazuki Yamamoto, Akihisa Koga
We investigate the non-Hermitian (NH) attractive Fermi-Hubbard model with asymmetric hopping and complex-valued interactions, which can be realized by collective one-body loss and…
Theory of non-Hermitian fermionic superfluidity on a honeycomb lattice: Interplay between exceptional manifolds and van Hove Singularity
Soma Takemori, Kazuki Yamamoto, Akihisa Koga
We study the non-Hermitian fermionic superfluidity subject to dissipation of Cooper pairs on a honeycomb lattice, for which we analyze the attractive Hubbard model with a complex-v…