258 citations · 1.4k across the 30 of their papers we have counts for
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Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
Shin-ichi Kimura, Hiroshi Watanabe, Shingo Tatsukawa +1
CeCoSi with no local inversion symmetric crystal structure () exhibits a phase transition of unknown origin (Hidden Order: HO) at about 12 K () above the antiferromagn…
Magneto-Optics of the Weyl Semimetal TaAs in the THz and IR Regions
Shin-ichi Kimura, Yuko Yokoyama, Yuki Nakajima +5
The magnetic-field dependence of optical reflectivity [] and optical conductivity [] spectra of the ideal type-I Weyl semimetal TaAs has been investigated at the temper…
Optical and photoelectrical studies on anisotropic metal-insulator transition of RuAs
Yuki Nakajima, Zenjiro Mita, Hiroshi Watanabe +6
The anisotropic changes in the electronic structure of a metal-to-insulator transition (MIT) material, RuAs, with two-step phase transition are reported by using polarized optical…
Charge-density wave induced by combined electron-electron and electron-phonon interactions in 1-TiSe: A variational Monte Carlo study
Hiroshi Watanabe, Kazuhiro Seki, Seiji Yunoki
To clarify the origin of a charge-density wave (CDW) phase in 1-TiSe, we study the ground state property of a half-filled two-band Hubbard model in a triangular lattice incl…
A variational Monte Carlo study of exciton condensation
Hiroshi Watanabe, Kazuhiro Seki, Seiji Yunoki
Exciton condensation in a two-band Hubbard model on a square lattice is studied with variational Monte Carlo method. We show that the phase transition from an excitonic insulator t…
Theoretical study of insulating mechanism in multi-orbital Hubbard models with a large spin-orbit coupling: Slater versus Mott scenario in SrIrO
Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki
To examine the insulating mechanism of 5 transition metal oxide SrIrO, we study the ground state properties of a three-orbital Hubbard model with a large relativistic sp…
Microscopic Study of Electronic and Magnetic Properties for Ir Oxide
Tomonori Shirakawa, Hiroshi Watanabe, Seiji Yunoki
The exact diagonalization and the variational cluster approximation (VCA) are used to study the nature of a novel Mott insulator induced by a strong spin-orbit coupling for a two-d…
Microscopic study of spin-orbit-induced Mott insulator in Ir oxides
Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki
Motivated by recent experiments of a novel 5 Mott insulator in SrIrO, we have studied the two-dimensional three-orbital Hubbard model with a spin-orbit coupling . The…
Crossover from dilute-Kondo system to heavy-fermion system
Hiroshi Watanabe, Masao Ogata
Ground state properties of a Kondo lattice model with random configuration of electrons are investigated with a variational Monte Carlo method. We show that the crossover from…
Fermi-Surface Reconstruction in the Periodic Anderson Model
Hiroshi Watanabe, Masao Ogata
We study ground state properties of periodic Anderson model in a two-dimensional square lattice with variational Monte Carlo method. It is shown that there are two different types…
Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point
Hiroshi Watanabe, Masao Ogata
Motivated by recent Hall-effect experiment in YbRhSi, we study ground state properties of a Kondo lattice model in a two-dimensional square lattice using variational Monte…
Novel Charge Order and Superconductivity in Two-Dimensional Frustrated Lattice at Quarter Filling
Hiroshi Watanabe, Masao Ogata
Motivated by the various physical properties observed in -(BEDT-TTF)X, we study the ground state of extended Hubbard model on two-dimensional anisotropic triangular lattice…
Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
Hiroshi Watanabe, Masao Ogata
To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study the extended Hubbard model with variational Monte Carlo…