Quantum phase transitions for bosons in one dimension
Institut für Theoretische Festkörperphysik,
Universität Karlsruhe D-76128 Karlsruhe, Germany
Accepted: 30 May 1997
We study the ground-state phase diagram and the critical properties of interacting bosons in one dimension by means of a quantum Monte Carlo technique. The direct experimental realization is a chain of Josephson junctions. For finite-range interactions we find a novel intermediate phase which shows neither solid order nor superfluidity. We determine the location of this phase and study the critical behaviour of the various transitions. For on-site interaction only, we map out the phase diagram as a function of the hopping strength and the chemical potential.
PACS: 05.30.Jp – Boson systems / 67.40.Db – Quantum statistical theory; ground state, elementary excitations / 67.90.+ z – Other topics in quantum fluids and solids; liquid and solid helium
© EDP Sciences, 1997