Quantum Phase Transitions of Hard-Core Bosons in Background Potentials
Anand Priyadarshee, Shailesh Chandrasekharan A, Ji-Woo Lee +1 more
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 approximately 1.4, nu approximately 1, and beta approximately 0.6.
arXiv:cond-mat/0607251•Physical Review Letters•Sep 13, 2006•36 citations