411 citations · 1.8k across the 31 of their papers we have counts for
27 papers · 1 filter
Theory of Fractionally-magnetized Quantum Ferromagnet
Isao Maruyama, Shin Miyahara
We present a theory to realize entangled quantum spin states with fractional magnetization. The origin of magnetization reduction is partly emergent antiferromagnetism, that is, sp…
Theory of absorption in a frustrated spin gap system
Shin Miyahara
We achieve a comprehensive understanding of the magnetic excitations observed by electric spin resonance and far-infrared spectroscopy in a frustrated spin gap system ${\rm SrCu_2(…
Direct coupling of ferromagnetic moment and ferroelectric polarization in BiFeO
Shiro Kawachi, Shin Miyahara, Toshimitsu Ito +4
The spin-driven component of electric polarization in a single crystal of multiferroic BiFeO was experimentally investigated in pulsed high magnetic fields up to 41 T. Sequen…
Fractionally quantized Berry phases of magnetization plateaux in spin- Heisenberg multimer chains
Isao Maruyama, Shin Miyahara
We study the fractionally quantized Berry phase, , to characterize local -mer spin structures at magnetization pl…
Identifying the Magnetoelectric Modes of Multiferroic BiFeO
Randy S. Fishman, Nobuo Furukawa, Jason T. Haraldsen +2
We have identified three of the four magnetoelectric modes of multiferroic BiFeO measured using THz spectroscopy. Excellent agreement with the observed peaks is obtained by inc…
Nonreciprocal Directional Dichroism and Toroidalmagnons in Helical Magnets
Shin Miyahara, Nobuo Furukawa
We investigate a dynamical magnetoelectric effect due to a magnetic resonance in helical spin structures through the coupling between magnetization and electric polarization via a…
Chirality of Matter Shows Up via Spin Excitations
Sandor Bordacs, Istvan Kezsmarki, David Szaller +10
Right- and left-handed circularly polarized light interact differently with electronic charges in chiral materials. This asymmetry generates the natural circular dichroism and gyro…
Theory of magnetoelectric resonance in two-dimensional antiferromagnet via spin-dependent metal-ligand hybridization mechanism
Shin Miyahara, Nobuo Furukawa
We investigate magnetic excitations in an Heisenberg model representing two-dimensional antiferromagnet . In terahertz absorption experiment of the com…
Raman scattering due to a one-magnon excitation process in
S. Miyahara, K. Takubo, T. Suzuki +2
Unconventional peak structure in the Raman spectra due to magnon excitation at low temperature is observed in spinel magnet , where a noncollinear spin state is rea…
Ferroelectricity induced by spin-dependent metal-ligand hybridization in BaCoGeO
H. Murakawa, Y. Onose, S. Miyahara +2
We have investigated the variation of induced ferroelectric polarization under magnetic field with various directions and magnitudes in a staggered antiferromagnet BaCoGeO$…
Theory of electric field induced one-magnon resonance in cycloidal spin magnets
S. Miyahara, N. Furukawa
We propose a new mechanism to induce a novel one-magnon excitation by the electric component of light in cycloidal spin states, i.e. so called electromagnon process. We calculated…
Variational Monte Carlo Study of a Spinless Fermion t-V Model on a Triangular Lattice: Formation of a Pinball Liquid
M. Miyazaki, C. Hotta, S. Miyahara +2
We analyze a model of spinless fermions on a triangular lattice at half-filling interacting via strong nearest-neighbor repulsive interactions, V, using the variational Monte Carlo…
Projection Method for Exact Diagonalization in the Strong Coupling Limit for Frustrated Models with Highly Degenerate Ground States
K. Matsuda, S. Miyahara, N. Furukawa
In this paper, we carry out a new technique named projection ED and indicate that it is applicable to the frustrated models, e.g., XXZ spin-1/2 Heisenberg and spinless fermion t-V…
Ising phases of Heisenberg ladders in a magnetic field
Karlo Penc, Jean-Baptiste Fouet, Shin Miyahara +2
We examine the influence of weak anisotropic interactions on the T=0 phase diagram of the frustrated two-leg Heisenberg ladder, a well-studied spin model exhibiting integer and fra…
Uniform and staggered magnetizations induced by Dzyaloshinskii-Moriya interactions in isolated and coupled spin 1/2 dimers in a magnetic field
S. Miyahara, J. -B. Fouet, S. R. Manmana +5
We investigate the interplay of Dzyaloshinskii-Moriya interactions and an external field in spin 1/2 dimers. For isolated dimers and at low field, we derive simple expressions for…
Flat-Bands on Partial Line Graphs -- Systematic Method for Generating Flat-Band Lattice Structures
Shin Miyahara, Kenn Kubo, Hiroshi Ono +2
We introduce a systematic method for constructing a class of lattice structures that we call ``partial line graphs''.In tight-binding models on partial line graphs, energy bands wi…
Mechanism for lifting the degeneracy in the double-exchange spin ice model on a kagomé lattice: Dodecamer formation
Yoshihiro Shimomura, Shin Miyahara, Nobuo Furukawa
We investigated the double-exchange spin ice model on a kagomé lattice by Monte Carlo simulation in order to study a mechanism for lifting the degeneracy in frustrated electron sys…
Orbital Ordering in ferromagnetic Lu2V2O7
H. Ichikawa, L. Kano, M. Saitoh +7
We have observed the orbital ordering in the ferromagnetic Mott-insulator Lu2V2O7 by the polarized neutron diffraction technique. The orbital ordering pattern determined from the o…
Spin Dodecamer Formation in the Double-Exchange Spin Ice Model
Yoshihiro Shimomura, Shin Miyahara, Nobuo Furukawa
We investigated the double-exchange spin ice (DESI) model on a kagomé lattice by Monte Carlo simulation to study the effects of a geometrical frustration, and the mechanism that ge…
Field-Induced Effects of Anisotropic Magnetic Interactions in SrCu2(BO3)2
K. Kodama, S. Miyahara, M. Takigawa +5
We observed a field-induced staggered magnetization in the 2D frustrated dimer-singlet spin system SrCu2(BO3)2 by 11B NMR, from which the magnitudes of the intradimer Dzyaloshinsky…
Theory of spin density profile in the magnetization plateaus of SrCu_2(BO_3)_2
Shin Miyahara, Federico Becca, Frederic Mila
The two-dimensional spin-gap system shows unique physical properties due to the low-dimensionality character and the strong quantum fluctuations. Experimenta…
Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2
K. Kodama, M. Takigawa, M. Horvatic +6
We report the observation of magnetic superstructure in a magnetization plateau state of SrCu2(BO3)2, a frustrated quasi-two-dimensional quantum spin system. The Cu and B nuclear m…
Thermodynamic Properties of Three-Dimensional Orthogonal Dimer Model for SrCu(BO)
Shin Miyahara, Kazuo Ueda
Effects of the inter-layer couplings for the orthogonal dimer system SrCu(BO) are discussed. The spin-gap of the three-dimensional model is independent of the inter…
Magnetic Susceptibilities of Spin-1/2 Antiferromagnetic Heisenberg Ladders and Applications to Ladder Oxide Compounds
D. C. Johnston, M. Troyer, S. Miyahara +11
A comprehensive theoretical and experimental study is presented of the magnetic susceptibility versus temperature χ(T) of spin S = 1/2 two- and three-leg Heisenberg ladders and lad…