We investigate a supersolid state in hardcore boson models on the face-centered-cubic (fcc) lattice. The supersolid state is characterized by a coexistence of crystalline order and superfluidity. Using a quantum Monte Carlo method based on the dir...
Sei-Ichiro Suga   Takahumi Suzuki   
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310(2) E381-E383 2007年3月 [査読有り]
We investigate NMR relaxation rates 1/T-1 of gapped quantum spin chains in magnetic fields. Universal properties for the divergence behavior of 1/T-1 with decreasing temperature are studied in a viewpoint of the Tomonaga-Luttinger liquid. On the b...
Takafumi Suzuki   Sei-Ichiro Suga   
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310(2) 1197-1199 2007年3月 [査読有り]
We calculate dynamical structure factors of the S = 1 bond-alternating spin chain in transverse magnetic fields. The numerical results successfully explain the field dependence of the peaks observed in recent inelastic neutron-scattering experimen...
Takahumi Suzuki   Sei-ichiro Suga   
PHYSICAL REVIEW B 74(17) 172410 2006年11月 [査読有り]
We investigate NMR relaxation rates 1/T-1 of quantum spin chains in magnetic fields. Universal properties for the divergence behavior of 1/T-1 are obtained in the Tomonaga-Luttinger-liquid state. The results are discussed in comparison with experi...
Specific-heat experiments on single crystals of the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9H24N4)(NO2)ClO4 (NTENP) have been performed in magnetic fields applied both parallel and perpendicular to the spin chains. We have ...
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 ...