307 citations · 1.7k across the 55 of their papers we have counts for
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Correlation functions at the topological quantum phase transition in the S=1 XXZ chain with single-ion anisotropy
Toshiya Hikihara, Akira Furusaki
We study the one-dimensional S=1 XXZ spin model with single-ion anisotropy. It is known that at the transition points between the Haldane and large-D phases, the model exhibits a q…
Entanglement-based tensor-network strong-disorder renormalization group
Kouichi Seki, Toshiya Hikihara, Kouichi Okunishi
We propose an entanglement-based algorithm of the tensor-network strong-disorder renormalization group (tSDRG) method for quantum spin systems with quenched randomness. In contrast…
Magnetoelastic study on the frustrated quasi-one-dimensional spin-1/2 magnet LiCuVO
A. Miyata, T. Hikihara, S. Furukawa +3
We investigated the magnetoelastic properties of the quasi-one-dimensional spin-1/2 frustrated magnet LiCuVO. Longitudinal-magnetostriction experiments were performed at 1.5 K…
Frustration-induced quantum spin liquid behavior in the 1/2 random-bond Heisenberg antiferromagnet on the zigzag chain
Kazuki Uematsu, Toshiya Hikihara, Hikaru Kawamura
Recent studies have revealed that the randomness-induced quantum spin liquid (QSL)-like state is stabilized in certain frustrated quantum magnets in two and three dimensions. In or…
Tensor-network strong-disorder renormalization groups for random quantum spin systems in two dimensions
Kouichi Seki, Toshiya Hikihara, Kouichi Okunishi
Novel randomness-induced disordered ground states in two-dimensional (2D) quantum spin systems have been attracting much interest. For quantitative analysis of such random quantum…
Spin nematics in frustrated spin-dimer systems with bilayer structure
Toshiya Hikihara, Takahiro Misawa, Tsutomu Momoi
We study frustrated spin-1/2 dimer systems in two dimensions with a bilayer structure, where spins are ferromagnetically coupled in dimers. Our model includes frustrated two-spin e…
Quantum phase transitions beyond Landau-Ginzburg theory in one-dimensional space revisited
Christopher Mudry, Akira Furusaki, Takahiro Morimoto +1
The phase diagram of the quantum spin-1/2 antiferromagnetic - XXZ chain was obtained by Haldane using bosonization techniques. It supports three distinct ph…
Ground-State Phase Diagram of an Anisotropic S=1/2 Ladder with Different Leg Interactions
Takashi Tonegawa, Toshiya Hikihara, Kiyomi Okamoto +2
We explore the ground-state phase diagram of the two-leg ladder with different leg interactions. The and components of the leg interactions between nearest-neighbo…
Dimer correlation amplitudes and dimer excitation gap in spin-1/2 XXZ and Heisenberg chains
Toshiya Hikihara, Akira Furusaki, Sergei Lukyanov
Correlation functions of dimer operators, the product operators of spins on two adjacent sites, are studied in the spin- XXZ chain in the critical regime. The amplitud…
Frustrated S=1/2 Two-Leg Ladder with Different Leg Interactions
Takashi Tonegawa, Kiyomi Okamoto, Toshiya Hikihara +1
We explore the ground-state phase diagram of the two-leg ladder with different isotropic leg interactions and uniform anisotropic rung ones, which is described by the H…
Ground-state phase diagram of an anisotropic S=1/2 ladder with alternating rung interactions
Takashi Tonegawa, Kiyomi Okamoto, Toshiya Hikihara +1
Employing mainly numerical methods, we explore the ground-state phase diagram of an anisotropic ladder, in which leg interactions are uniform and isotropic, while rung inte…
Spin-Nematic and Spin-Density-Wave Orders in Spatially Anisotropic Frustrated Magnets in a Magnetic Field
Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi
We develop a microscopic theory of finite-temperature spin-nematic orderings in three-dimensional spatially anisotropic magnets consisting of weakly-coupled frustrated spin-1/2 cha…
NMR relaxation rate in the field-induced octupolar liquid phase of spin-1/2 J1-J2 frustrated chains
Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi
In the spin-1/2 frustrated chain with nearest-neighbor ferromagnetic exchange J1 and next-nearest-neighbor antiferromagnetic exchange J2 under magnetic field, magnetic multipolar-l…
Field and temperature dependence of the NMR relaxation rate in the magnetic quadrupolar liquid phase of spin-1/2 frustrated ferromagnetic chains
Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi
It is generally difficult to experimentally distinguish magnetic multipolar orders in spin systems. Recently, it was proposed that the temperature dependence of the nuclear magneti…
Vector chiral and multipolar orders in the spin-1/2 frustrated ferromagnetic chain in magnetic field
Toshiya Hikihara, Lars Kecke, Tsutomu Momoi +1
We study the one-dimensional spin-1/2 Heisenberg chain with competing ferromagnetic nearest-neighbor J_1 and antiferromagnetic next-nearest-neighbor J_2 exchange couplings in the p…
Magnetic Phase Diagram of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange
Toshiya Hikihara, Shoji Yamamoto
We study the spin-1/2 two-leg Heisenberg ladder with four-spin ring exchanges under a magnetic field. We introduce an exact duality transformation which is an extension of the spin…
Spin dynamics in molecular ring nanomagnets: Significant effect of acoustic phonons and magnetic anisotropies
Shoji Yamamoto, Toshiya Hikihara
The nuclear spin-lattice relaxation rate 1/T_1_ is calculated for magnetic ring clusters by fully diagonalizing their microscopic spin Hamiltonians. Whether the nearest-neighbor ex…
Interplay among Spin, Orbital and Lattice Degrees of Freedom in Electron Systems with Edge-Sharing Network of Octahedra
Yukitoshi Motome, Hirokazu Tsunetsugu, Toshiya Hikihara +2
Transition metal oxides whose lattice structure has edge-sharing network of octahedra constitute a diverse group of intriguing materials besides compounds with corner-sharing octah…
Duality relations and exotic orders in electronic ladder systems
Tsutomu Momoi, Toshiya Hikihara
We discuss duality relations in correlated electronic ladder systems to clarify mutual relations between various conventional and unconventional phases. For the generalized two-leg…
Renormalization of impurity scattering in one-dimensional interacting electron systems in magnetic field
T. Hikihara, A. Furusaki, K. A. Matveev
We study the renormalization of a single impurity potential in one-dimensional interacting electron systems in the presence of magnetic field. Using the bosonization technique and…
Phase transitions in spin-orbital coupled model for pyroxene titanium oxides
Toshiya Hikihara, Yukitoshi Motome
We study the competing phases and the phase transition phenomena in an effective spin-orbital coupled model derived for pyroxene titanium oxides ATiSi2O6 (A=Na, Li). Using the mean…
Spintronics at Nanoscale: Flat-Band Ferromagnetism in Armchair Nanoribbons and Nanotubes
Hsiu-Hau Lin, Toshiya Hikihara, Bor-Lung Huang +2
We study the electronic correlation effects in armchair nanoribbon and nanotube using weak-coupling approach and non-Abelian density-matrix renormalization-group method. We show th…
Orbital and spin interplay in spin-gap formation in pyroxene titanium oxides ATiSi2O6 (A=Na, Li)
Toshiya Hikihara, Yukitoshi Motome
Interplay between orbital and spin degrees of freedom is theoretically studied for the phase transition to the spin-singlet state with lattice dimerization in pyroxene titanium oxi…
Correlation Amplitudes for the spin-1/2 XXZ chain in a magnetic field
T. Hikihara, A. Furusaki
We present accurate numerical estimates for the correlation amplitudes of leading and main subleading terms of the two- and four-spin correlation functions in the one-dimensional s…