Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-01-14
Phys. Rev. B 70, 024513 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 10 figures
Scientific paper
10.1103/PhysRevB.70.024513
The generic transition in the boson Hubbard model, occurring at an incommensurate chemical potential, is studied in the link-current representation using the recently developed directed geometrical worm algorithm. We find clear evidence for a multi-peak structure in the energy distribution for finite lattices, usually indicative of a first order phase transition. However, this multi-peak structure is shown to disappear in the thermodynamic limit revealing that the true phase transition is second order. These findings cast doubts over the conclusion drawn in a number of previous works considering the relevance of disorder at this transition.
Alet Fabien
Sorensen Erik S.
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