1.3k citations · 11.3k across the 172 of their papers we have counts for
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Enhanced spin-orbit coupling and orbital moment in ferromagnets by electron correlations
Ze Liu, Jing-Yang You, Bo Gu +2
In atomic physics, the Hund rule says that the largest spin and orbital state is realized due to the interplay of the spin-orbit coupling (SOC) and the Coulomb interactions. Here,…
Anisotropic spin distribution and perpendicular magnetic anisotropy in the layered ferromagnetic semiconductor (Ba,K)(Zn,Mn)As
Shoya Sakamoto, Guoqiang Zhao, Goro Shibata +14
Perpendicular magnetic anisotropy of the new ferromagnetic semiconductor (Ba,K)(Zn,Mn)As is studied by angle-dependent x-ray magnetic circular dichroism measurements. T…
Magnetic mechanism for the biological functioning of hemoglobin
Selma Mayda, Zafer Kandemir, Nejat Bulut +1
The role of magnetism in the biological functioning of hemoglobin has been debated since its discovery by Pauling and Coryell in 1936. The hemoglobin molecule contains four heme gr…
Observation of spin current in quantum spin liquid
Daichi Hirobe, Masahiro Sato, Takayuki Kawamata +6
Spin liquid is a state of electron spins in which quantum fluctuation breaks magnetic ordering while maintaining spin correlation. It has been a central topic in magnetism because…
Quasi-Spin Correlations in a Frustrated Quantum Spin Ladder
Takanori Sugimoto, Michiyasu Mori, Takami Tohyama +1
The quasi-spin correlations in a frustrated quantum spin ladder with one-half magnetization are theoretically studied by using the density-matrix renormalization-group method and t…
Magnetization Plateaux by Reconstructed Quasi-spinons in a Frustrated Two-Leg Spin Ladder under a Magnetic Field
Takanori Sugimoto, Michiyasu Mori, Takami Tohyama +1
The quantum phase transitions induced by a magnetic field are theoretically studied in a frustrated two-leg spin ladder. Using the density-matrix renormalization-group method, we f…
Analysis of the spin Hall effect in CuIr alloys: Combined approach of density functional theory and Hartree-Fock approximation
Zhuo Xu, Bo Gu, Michiyasu Mori +2
We analyze the spin Hall effect in CuIr alloys in theory by the combined approach of the density functional theory (DFT) and Hartree-Fock (HF) approximation. The SHA is obtained to…
Lifshitz Transition Induced by Magnetic Field in Frustrated Two-Leg Spin-Ladder Systems
Takanori Sugimoto, Michiyasu Mori, Takami Tohyama +1
The magnetization curve in a frustrated two-leg spin-ladder system is theoretically studied using both analytical and numerical methods. This spin system is mapped onto a hard-core…
Spin-Spin Correlation Enhanced by Impurities in a Frustrated Two-leg Spin Ladder
Takanori Sugimoto, Michiyasu Mori, Takami Tohyama +1
We theoretically study a spin-spin correlation enhanced by non-magnetic impurities in a frustrated two-leg spin ladder. The frustration is introduced by the next-nearest-neighbor a…
Frustration effect on magnetic excitations in a two-leg spin-ladder system
Takanori Sugimoto, Michiyasu Mori, Takami Tohyama +1
We theoretically study the magnetic excitations in a frustrated two-leg spin-ladder system, in which antiferromagnetic exchange interactions act on the nearest-neighbor and next-ne…
Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF3
K. Ishii, S. Ishihara, Y. Murakami +13
We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of orbital excitations in KCuF3 . By performing the polarization analysis of the scattered photons, we disclo…
Relaxation Dynamics of Photocarriers in One-Dimensional Mott Insulators Coupled to Phonons
Hiroaki Matsueda, Shigetoshi Sota, Takami Tohyama +1
We examine recombination processes of photocarriers in one-dimensional Mott insulators coupled to phonons. Performing density matrix renormalization group calculations, we find tha…
Hole Binding around Ni Impurity in Cuprates
K. Tsutsui, A. Toyama, T. Tohyama +1
We examine the influence of Ni impurity in cuprates on the distribution of hole carriers by performing numerically exact diagonalization calculations for a model consisting of Cu3d…
Enhanced spin Hall effect by resonant skew scattering in orbital-selective Kondo effect
Guang-Yu Guo, Sadamichi Maekawa, Naoto Nagaosa
The enhanced spin Hall effect in Au metal due to the resonant skew scattering is studied with first-principles band structure calculations. Especially the gigantic spin Hall angle…
Inter-impurity and impurity-host magnetic correlations in semiconductors with low-density transition-metal impurities
Yoshihiro Tomoda, Nejat Bulut, Sadamichi Maekawa
Experiments on (Ga,Mn)As in the low-doping insulating phase have shown evidence for the presence of an impurity band at 110 meV above the valence band. The motivation of this paper…
Enhancement of phonon effects in photoexcited states of one-dimensional Mott insulators
Hiroaki Matsueda, Akihiro Ando, Takami Tohyama +1
We examine how the electron correlation affects the electron-phonon (EP) interaction in the linear optical absorption spectrum of the one-dimensional (1D) extended Hubbard-Holstein…
Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic x-ray scattering
K. Ishii, M. Hoesch, T. Inami +14
We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of high-Tc cuprates. Momentum-resolved charge excitations in the CuO2 plane are examined from parent Mott ins…
Momentum Dependent Charge Excitations of Two-Leg Ladder: Resonant Inelastic X-ray Scattering of (La,Sr,Ca)14Cu24O41
K. Ishii, K. Tsutsui, T. Tohyama +8
Momentum dependent charge excitations of a two-leg ladder are investigated by resonant inelastic x-ray scattering of (La,Sr,Ca)14Cu24O41. In contrast to the case of a square lattic…
Long-range ferromagnetic correlations between Anderson impurities in a semiconductor host
N. Bulut, K. Tanikawa, S. Takahashi +1
We study the two-impurity Anderson model for a semiconductor host using the quantum Monte Carlo technique. We find that the impurity spins exhibit ferromagnetic correlations with a…
Theory of RIXS in strongly correlated electron systems: Mott gap excitations in cuprates
T. Tohyama, K. Tsutsui, S. Maekawa
We theoretically examine the momentum dependence of resonant inelastic x-ray scattering (RIXS) spectrum for one-dimensional and two-dimensional cuprates based on the single-band Hu…
Electron-phonon coupling and spin-charge separation in one-dimensional Mott insulators
Hiroaki Matsueda, Takami Tohyama, Sadamichi Maekawa
We examine the single-particle excitation spectrum in the one-dimensional Hubbard-Holstein model at half-filling by performing the dynamical density matrix renormalization group (D…
Charge Imbalance Effects on Interlayer Hopping and Fermi Surfaces in Multilayered High-T_c Cuprates
M. Mori, T. Tohyama, S. Maekawa
We study doping dependence of interlayer hoppings, t_\perp, in multilayered cuprates with four or more CuO_2 planes in a unit cell. When the double occupancy is forbidden in the pl…
Low energy electronic states and triplet pairing in layered cobaltates
G. Khaliullin, W. Koshibae, S. Maekawa
The structure of the low-energy electronic states in layered cobaltates is considered starting from the Mott insulating limit. We argue that the coherent part of the wave-functions…
Strength of the d_{x^2-y^2} pairing in the two-leg Hubbard ladder
N. Bulut, S. Maekawa
In the ground state of the doped two-leg Hubbard ladder there are power-law decaying d_{x^2-y^2}-type pairing correlations. It is important to know the strength and the temperature…