Quantum Phase Transitions of Hard-Core Bosons in Background Potentials

Details Quantum Phase Transitions of Hard-Core Bosons in Background Potentials Quantum Phase Transitions of Hard-Core Bosons in Background Potentials

2006-07-10

arxiv.org/abs/cond-mat/0607251v2

Phys. Rev. Lett. 97, 115703 (2006)

Physics

Condensed Matter

Statistical Mechanics

4 pages (6 figures); published version-- 2 references added, minor clarifications

Scientific paper

10.1103/PhysRevLett.97.115703

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, \nu~1, and \beta~0.6.

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