3 papers
cond-mat.stat-mech2001
Bethe Ansatz Solutions and Excitation Gap of the Attractive Bose-Hubbard Model
Deok-Sun Lee, Doochul Kim
The energy gap between the ground state and the first excited state of the one-dimensional attractive Bose-Hubbard Hamiltonian is investigated in connection with directed polymers…
cond-mat1999
Possibility of direct Mott insulator-to-superfluid transitions in weakly disordered boson systems
Sung Yong Park, Ji-Woo Lee, Min-Chul Cha +3
We study the zero-temperature phase transitions of a two-dimensional disordered boson Hubbard model at incommensurate boson densities. Via matrix diagonalization and quantum Monte…
cond-mat1993
Honeycomb lattice solvable models
Kyung-Hoon Kwon, Doochul Kim
We construct solvable models on the honeycomb lattice by combining three faces of the square lattice solvable models into a hexagon face. These models contain two independent, anis…