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Supersolid state in fermionic optical lattice systems
Akihisa Koga, Takuji Higashiyama, Kensuke Inaba +2
We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by combining the real-space dynamical mean-field theory with a two-site impurity solver.…
Quantum Phase Transitions in the Hubbard Model on Triangular Lattice
Takuya Yoshioka, Akihisa Koga, Norio Kawakami
We investigate the quantum phase transitions in the half-filled Hubbard model on the triangular lattice by means of the path-integral renormalization group (PIRG) method with a new…
Mott insulating state in a quarter-filled two-orbital Hubbard chain with different bandwidths
S. Miyashita, Y. Yamashita, K. Yonemitsu +2
We investigate the ground-state properties of the one-dimensional two-band Hubbard model with different bandwidths. The density-matrix renormalization group method is applied to ca…
Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions
Yusuke Fujihara, Akihisa Koga, Norio Kawakami
We investigate two-component ultracold fermionic atoms with repulsive interactions trapped in an optical lattice with a ladder structure. By applying the Bogoliubov-de Gennes equat…
Zero-temperature Phase Diagram of Two Dimensional Hubbard Model
K. Inaba, A. Koga, S. Suga +1
We investigate the two-dimensional Hubbard model on the triangular lattice with anisotropic hopping integrals at half filling. By means of a self-energy functional approach, we dis…
Systematic Analysis of Frustration Effects in Anisotropic Checkerboard Lattice Hubbard Model
Takuya Yoshioka, Akihisa Koga, Norio Kawakami
We study the ground state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping and next nearest-neighb…