364 citations · 816 across the 24 of their papers we have counts for
23 papers · 1 filter
Existence of two distinct valence bond solid states in the dimerized frustrated ferromagnetic -- chain
Jędrzej Wardyn, Satoshi Nishimoto, Cliò Efthimia Agrapidis
We study the frustrated and dimerized ferromagnetic-antiferromagnetic -- chain using the density-matrix renormalization group (DMRG) method. Based on numerical calc…
Phase diagram of the Kitaev-Heisenberg model using various finite-size clusters
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We estimate phase boundaries of four ordered and two spin-liquid phases for the spin- Kitaev-Heisenberg (KH) model using four kinds of relatively-small clusters, based…
Study of Staggered Magnetization in the Spin- Square-Lattice Heisenberg Model Using Spiral Boundary Conditions
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We propose an efficient numerical method to obtain local order parameter in two-dimensional systems using spiral boundary conditions. As a benchmark, we first estimate the magnitud…
NaRuO: Kitaev-Heisenberg exchange in triangular-lattice setting
Pritam Bhattacharyya, Nikolay A. Bogdanov, Satoshi Nishimoto +2
Kitaev exchange, a new paradigm in quantum magnetism research, occurs for 90 metal-ligand-metal links, transition ions, and sizable spin-orbit coupling. It is…
Disorder effects in the Kitaev-Heisenberg model
Ayushi Singhania, Jeroen van den Brink, Satoshi Nishimoto
We study the interplay of disorder and Heisenberg interactions in Kitaev model on honeycomb lattice. The effect of disorder on the transition between Kitaev spin liquid and magneti…
Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe
Tao Xie, A. A. Eberharter, Jie Xing +14
Fifty years after Anderson's resonating valence-bond proposal, the spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) remains the ultimate platform to explore highly en…
One-dimensional projection of two-dimensional systems using spiral boundary conditions
Masahiro Kadosawa, Masaaki Nakamura, Yukinori Ohta +1
We introduce spiral boundary conditions (SBCs) as a useful tool for handling the shape of finite-size periodic clusters. Using SBCs, a lattice model for more than two dimensions ca…
First Order Topological Phase Transitions and Disorder Induced Majorana Modes in Interacting Fermion Chains
Shruti Agarwal, Shreekant Gawande, Satoshi Nishimoto +2
Using a combination of the mean-field Bogoliubov deGennes (BdG) approach and the Density Matrix Renormalization Group (DMRG) method, we discover first order topological transitions…
Low-energy spin excitations of the frustrated ferromagnetic - chain material linarite, PbCuSO(OH), in applied magnetic fields axis
L. Heinze, M. D. Le, O. Janson +4
We report a study of the spin dynamics of the frustrated ferromagnetic - chain compound linarite, PbCuSO(OH), in applied magnetic fields up to field polarization.…
Coupled frustrated ferromagnetic and antiferromagnetic quantum spin chains in the quasi-one-dimensional mineral antlerite, CuSO(OH)
Anton A. Kulbakov, Denys Y. Kononenko, Satoshi Nishimoto +14
Magnetic frustration, the competition among exchange interactions, often leads to novel magnetic ground states with unique physical properties which can hinge on details of interac…
Field-Induced Spin Excitations in the Spin-1/2 Triangular-Lattice Antiferromagnet CsYbSe
Tao Xie, Jie Xing, S. E. Nikitin +7
A layered triangular lattice with spin-1/2 ions is an ideal platform to explore highly entangled exotic states like quantum spin liquid (QSL). Here, we report a systematic in-field…
Breakdown of magnetic order in the pressurized Kitaev iridate -LiIrO
M. Majumder, R. S. Manna, G. Simutis +14
Temperature-pressure phase diagram of the Kitaev hyperhoneycomb iridate -LiIrO is explored using magnetization, thermal expansion, magnetostriction, and muon spin rotati…
Evidence for a Field-induced Quantum Spin Liquid in -RuCl
S. -H. Baek, S. -H. Do, K. -Y. Choi +5
We report a Cl nuclear magnetic resonance study in the honeycomb lattice, -RuCl, a material that has been suggested to potentially realize a Kitaev quantum spin liqui…
Spin gap of the three-leg S=3/2 Heisenberg tube
S. Nishimoto, Y. Fuji, Y. Ohta
The ground-state properties of the three-leg S=3/2 Heisenberg tube are studied using the density-matrix renormalization group method. We find that the spin-excitation gap associate…
Finite-size scaling of correlation functions in one-dimensional Anderson-Hubbard model
S. Nishimoto, T. Shirakawa
We study the one-dimensional Anderson-Hubbard model using the density-matrix renormalization group method. The influence of disorder on the Tomonaga-Luttinger liquid behavior is qu…
Low-lying excitations of the three-leg spin tube using the density-matrix renormalization group method
S. Nishimoto, M. Arikawa
Using the (dynamical) density-matrix renormalization group method, we study the low-energy physics of three-leg antiferromagnetic Heisenberg model where the periodic boundary condi…
Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction
T. Shirakawa, S. Nishimoto, Y. Ohta
We study the ground-state properties of the double-chain Hubbard model coupled with ferromagnetic exchange interaction by using the weak-coupling theory, density-matrix renormaliza…
Charge Ordering in the One-Dimensional Extended Hubbard Model: Implication to the TMTTF Family of Organic Conductors
Y. Shibata, S. Nishimoto, Y. Ohta
We study the charge ordering (CO) in the one-dimensional (1D) extended Hubbard model at quarter filling where the nearest-neighbor Coulomb repulsion and dimerization in the hopping…
Optical Conductivity of the Trellis-Lattice t-J Model: Charge Fluctuations in NaV_2O_5
S. Nishimoto, Y. Ohta
Optical conductivity of the trellis lattice t-J model at quarter filling is calculated by an exact-diagonalization technique on small clusters, whereby the valence state of V ions…
A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5
S. Nishimoto, Y. Ohta
An exact-diagonalization technique on small clusters is used to calculate the dynamical density correlation functions of the dimerized t-J chain and coupled anisotropic t-J ladders…
NaV_2O_5 as an Anisotropic t-J Ladder at Quarter Filling
S. Nishimoto, Y. Ohta
Based on recent experimental evidences that the electronic charge degrees of freedom plays an essential role in the spin-Peierls--like phase transition of NaVO, we first ma…
Critical Dimerization Strength of the Quarter-Filled t-J Model
S. Nishimoto, Y. Ohta
An exact-diagonalization technique on small clusters is used to study the ground state of the dimerized t-J model at quarter filling. The equal-time charge and spin correlations, c…
Landau mapping and Fermi liquid parameters of the 2D t-J model
S. Nishimoto, Y. Ohta, R. Eder
We study the momentum distribution function n(k) in the 2D t-J model on small clusters by exact diagonalization. We show that n(k) can be decomposed systematically into two compone…