Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-01-24
Phys. Rev. B 83, 100511(R) (2011)
Physics
Condensed Matter
Quantum Gases
4.2 pages, 4 figures; minor changes, published version
Scientific paper
10.1103/PhysRevB.83.100511
By means of quantum Monte Carlo simulations implemented with a two-loop update scheme, the finite-temperature phase diagram of a three-body constrained attractive Bose lattice gas is investigated. The nature of the thermal phase transitions around the dimer superfluid and the atomic superfluid is unveiled. We find that the $Z_2$ symmetry-breaking transitions between these two superfluid phases are of first order even at nonzero temperatures. More interestingly, the thermal transition from the dimer superfluid to the normal fluid is found to be consistent with the Kosterlitz-Thouless type but giving an anomalous universal stiffness jump. It demonstrates that this transition is driven by unbinding of pairs of fractional vortices.
Ng Kwai-Kong
Yang Min-Fong
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