Phys. Rev. Lett. 97, 115703 (2006) [4 pages]Quantum Phase Transitions of Hard-Core Bosons in Background PotentialsReceived 12 July 2006; published 13 September 2006 We study the zero temperature phase diagram of hard-core bosons in two dimensions subjected to three types of background potentials: staggered, uniform, and random. In all three cases there is a quantum phase transition from a superfluid (at small potential) to a normal phase (at large potential), but with different universality classes. As expected, the staggered case belongs to the XY universality, while the uniform potential induces a mean field transition. The disorder driven transition is clearly different from both; in particular, we find z∼1.4, ν∼1, and β∼0.6. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.115703
DOI:
10.1103/PhysRevLett.97.115703
PACS:
64.60.Fr, 05.30.Jp, 74.78.−w, 75.10.Jm
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