NiCl 2-4 SC (NH 2) 2 (DTN) is a quantum S= 1 chain system with strong easy-pane
anisotropy and a new candidate for the Bose-Einstein condensation of the spin degrees of …

We use numerical methods to demonstrate that the phase diagram of S= 1 Heisenberg
models with uniaxial anisotropy contains an extended supersolid phase. We show that this …

This article considers recent advances in the investigation of the thermal and magnetic
properties of integrable spin ladder models and their applicability to the physics of strong …

The ground states of Klein-type spin models on the pyrochlore and checkerboard lattice are
spanned by the set of singlet dimer coverings and thus possess an extensive ground-state …

We consider an S= 1 Heisenberg chain with strong exchange (Δ= J z/J⊥) and single-ion
uniaxial anisotropy (D) in a magnetic field (B) along the symmetry axis. The low-energy …

The quantum magnet Ni Cl 2–4 SC (NH 2) 2 is a candidate for observing Bose-Einstein
condensation of spin degrees of freedom in applied magnetic fields. An XY …

In this paper, we study the laser-pulse control of vibrational excitation for small molecules by
employing an algebraic model. The analytical expression for the vibrational transition …

We study the strong-coupling limit of a two-band Hubbard Hamiltonian that includes an
interorbital on-site repulsive interaction U ab. When the two bands have opposite parity and …

In the U (4) algebraic framework, the triatomic molecules are of U1 (4)⊗ U2 (4) dynamical
symmetry. A molecular Hamiltonian is constructed including the third‐order conbination of …

Nanosystems and strongly correlated systems can possess a more complicated internal Lie-
group dynamics in comparison with the Lie-group dynamics of Bose and Fermi systems …