103 citations · 374 across the 18 of their papers we have counts for
16 papers · 1 filter
Study on the validity of IPT+parquet method as an impurity solver in DMFT focusing on orbital fluctuations
Aira Yamada, Ryota Mizuno, Masayuki Ochi +2
A breakdown of calculations with exact impurity solvers in the dynamical mean field theory in multiband systems easily occurs due to the expensive numerical cost. To overcome this…
Mott transition in the Hubbard model on the anisotropic kagomé lattice
Yuta Furukawa, Takuma Ohashi, Yohta Koyama +1
We investigate the Mott transition in the anisotropic kagomé lattice Hubbard model using the cellular dynamical mean field theory combined with continuous-time quantum Monte Carlo…
Spatial fluctuations of spin and orbital in two-orbital Hubbard model
Tomoko Kita, Takuma Ohashi, Sei-ichiro Suga
We investigate the quasiparticle dynamics in the two-orbital Hubbard model on the square lattice at quarter filling by means of the cellular dynamical mean field theory. We show th…
Finite-Temperature Mott Transition in Two-Dimensional Frustrated Hubbard Models
Takuma Ohashi, Tsutomu Momoi, Hirokazu Tsunetsugu +1
We investigate the Hubbard model on two typical frustrated lattices in two dimensions, the kagome lattice and the anisotropic triangular lattice, by means of the cellular dynamical…
Three-orbital Kondo effect in single quantum dot system with plural electrons
Tomoko Kita, Rui Sakano, Takuma Ohashi +1
We study the Kondo effect and related transport properties in orbitally degenerate vertical quantum dot systems with plural electrons. Applying the non-crossing approximation to th…
Finite temperature Mott transition in Hubbard model on anisotropic triangular lattice
Takuma Ohashi, Tsutomu Momoi, Hirokazu Tsunetsugu +1
We investigate the Hubbard model on the anisotropic triangular lattice by means of the cellular dynamical mean field theory. The phase diagram determined in the Hubbard interaction…
Anomalous magnetic properties near Mott transition in Kagomé lattice Hubbard model
Takuma Ohashi, Sei-ichiro Suga, Norio Kawakami +1
We investigate the characteristics of the metallic phase near the Mott transition in the Kagomé lattice Hubbard model using the cellular dynamical mean field theory. By calculating…
Magnetic correlations around the Mott transition in the Kagomé lattice Hubbard model
Takuma Ohashi, Sei-ichiro Suga, Norio Kawakami +1
We study the magnetic properties around the Mott transition in the Kagomé lattice Hubbard model by the cellular dynamical mean field theory combined with quantum Monte Carlo simula…
Mott transition in Kagomé lattice Hubbard model
Takuma Ohashi, Norio Kawakami, Hirokazu Tsunetsugu
We investigate the Mott transition in the Kagomé lattice Hubbard model using a cluster extension of dynamical mean field theory. The calculation of the double occupancy, the densit…
Magnetic properties of a Kondo insulator with RKKY interaction: Extended dynamical mean field study
Takuma Ohashi, Sei-ichiro Suga, Norio Kawakami
We study the Kondo lattice model with the Heisenberg-type RKKY-exchange coupling among localized f-spins in the presence of a magnetic field. By means of an extended dynamical mean…
Field-induced phase transition in the periodic Anderson model
Takuma Ohashi, Akihisa Koga, Sei-ichiro Suga +1
We investigate the effect of magnetic fields on a Kondo insulator by using the periodic Anderson model. The analysis by dynamical mean field theory combined with quantum Monte Carl…
Field-induced phase transitions in a Kondo insulator
Takuma Ohashi, Akihisa Koga, Sei-ichiro Suga +1
We study the magnetic-field effect on a Kondo insulator by exploiting the periodic Anderson model with the Zeeman term. The analysis using dynamical mean field theory combined with…
Periodic Anderson model with degenerate orbitals: linearized dynamical mean field theory approach
Ryota Sato, Takuma Ohashi, Akihisa Koga +1
We investigate a multi-orbital extension of the periodic Anderson model with particular emphasis on electron correlations including orbital fluctuations. By means of a linearized v…
Effects of degenerate orbitals on the Hubbard model
Akihisa Koga, Takuma Ohashi, Yoshiki Imai +2
Stability of a metallic state in the two-orbital Hubbard model at half-filling is investigated. We clarify how spin and orbital fluctuations are enhanced to stabilize the formation…
Kondo effect in two-dimensional disordered electron systems
S. Suga, T. Ohashi
We investigate the Kondo effect in two-dimensional disordered electron systems using a finite-temperature quantum Monte Carlo method. Depending on the position of a magnetic impuri…
Susceptibility of a Magnetic Impurity in Two-Dimensional Disordered Electron Systems
Takuma Ohashi, Sei-ichiro Suga
We investigate the Kondo effect in two-dimensional disordered electron systems using a finite-temperature quantum Monte Carlo method. Depending on the position of a magnetic impuri…