585 citations · 1.1k across the 46 of their papers we have counts for
47 papers
Superconductivity and Low Energy Excitations in an Attractive Hubbard Model
Yukimi Goto, Tohru Koma, Hironobu Yoshida
We study an attractive Hubbard model on bipartite lattices. In the grand canonical formalism,we prove the existence of superconducting long-range order in the ground state on Lieb…
Antiferromagnetic Long-Range Order in a Lattice Fermion Model
Yukimi Goto, Tohru Koma
We study a lattice fermion model with antiferromagnetic interactions on the three-dimensional cubic lattice. The hopping term of the Hamiltonian has a Weyl-type dispersion. We prov…
Violation of Parity and Flavor Symmetries in a Nambu-Jona-Lasinio Model
Yukimi Goto, Tohru Koma
We study a lattice Nambu-Jona-Lasinio model with certain continuous chiral and two-flavor symmetries. For the Hamiltonian of the model, we construct a ground state which breaks the…
Nambu-Goldstone modes in a lattice Nambu-Jona-Lasinio model with multi flavor symmetries
Yukimi Goto, Tohru Koma
We study a lattice Nambu-Jona-Lasinio model with SU(2) and SU(3) flavor symmetries of staggered fermions in the Kogut-Susskind Hamiltonian formalism. This type of four-fermion inte…
A Concrete Example of Fractional Chern Insulator
Tohru Koma
We present a concrete example of fractional Chern insulator whose fermion Hamiltonian consists of hopping and Coulomb repulsive interaction terms. Both of them are of finite range…
Spontaneous mass generation and chiral symmetry breaking in a lattice Nambu-Jona-Lasinio model
Yukimi Goto, Tohru Koma
We study a lattice Nambu-Jona-Lasinio model with interacting staggered fermions in the Kogut-Susskind Hamiltonian formalism. The model has a discrete chiral symmetry but not the us…