Takafumi Suzuki   Sei-Ichiro Suga   
Journal of Physics: Conference Series 969(1) 2018年4月 [査読有り]
Honeycomb-lattice magnet α-RuCl3 is considered to be a potential candidate of realizing Kitaev spin liquid, although this material undergoes a phase transition to the zigzag magnetically ordered state at T N ∼ 7 K. Quite recently, inelastic neutro...
We investigate ground state energies and low-energy excitations of the S = 1/2 Kitaev-Heisenberg model on honeycomb lattices by using dimer series expansions. We find that dimer series expansions can approach the close vicinity of the Kitaev limit...
Contrary to the original expectation, NaIrO is not a Kitaev's quantum
spin liquid (QSL) but shows a zig-zag-type antiferromagnetic order in
experiments. Here we propose experimental clues and criteria to measure how a
material in hand is c...
Takafumi Suzuki   Takuto Yamada   Youhei Yamaji   Sei-ichiro Suga   
PHYSICAL REVIEW B 92(18) 2015年11月 [査読有り]
We investigate the dynamical properties of Na2IrO3. For five effective models proposed for Na2IrO3, we numerically calculate dynamical structure factors (DSFs) with an exact diagonalization method. An effective model obtained from ab initio calcul...
We investigate thermal phase transitions to a valence-bond solid phase in SU(N) Heisenberg models with four-or six-body interactions on a square or honeycomb lattice, respectively. In both cases, a thermal phase transition occurs that is accompani...
A numerical algorithm to calculate exact finite-temperature spectra of<br />
many-body lattice Hamiltonians is formulated by combining the typicality<br />
approach and the shifted Krylov subspace method. The combined algorithm, which<br />
we nam...
Takafumi Suzuki   Masahiro Sato   
2015年5月
We study the boundary nature of trapped bosonic Mott insulators in optical<br />
square lattices, by performing quantum Monte Carlo simulation. We show that a<br />
finite superfluid density generally emerges in the incommensurate-filling (IC)<br ...