246 citations · 550 across the 11 of their papers we have counts for
11 papers
SU(3) Dirac electrons in the 1/5-depleted square-lattice Hubbard model at 1/4 filling
Yasufumi Yamashita, Masaki Tomura, Yuki Yanagi +1
We investigate the magnetic and metal-insulator (M-I) phase diagram of the 1/5-depleted square-lattice Hubbard model at 1/4 filling by the mean-field approximation. There exist thr…
Dimensional Reduction and Odd-Frequency Pairing of the Checkerboard-Lattice Hubbard Model at 1/4-Filling
Yuki Yanagi, Yasufumi Yamashita, Kazuo Ueda
The ferromagnetism of the checkerboard lattice Hubbard model at quarter filling is one of the few exact ferromagnetic ground states known in the family of Hubbard models. When the…
Microscopic model for the semiconductor-to-ferromagnetic-metal transition in FeSiGe Alloys
Kai-Yu Yang, Y. Yamashita, A. M. Läuchli +2
The simplified bandstructure introduced by Mazurenko et al to model FeSi is used to analyze the singlet semiconductor to ferromagnetic metal transition in the isoelectronic isostru…
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…
Effective Interaction between the inter-penetrating Kagome lattices in Na_xCoO_2
Martin Indergand, Yasufumi Yamashita, Hiroaki Kusunose +1
A multi-orbital model for a CoO_2-layer in Na_xCoO_2 is derived. In this model the kinetic energy for the degenerate t_2g-orbitals is given by indirect hopping over oxygen, leading…
Spin-Orbital Fluctuations and a large mass enhancement in LiV_2O_4
Yasufumi Yamashita, Kazuo Ueda
We present a scenario that the multi-component fluctuations, especially those of the spin-orbital coupled modes, lead to the mass enhancement observed in LiV_2O_4. This phenomena i…