Publications [#245110] of Harold U. Baranger

Papers Published

1. Priyadarshee, A; Chandrasekharan, S; Lee, JW; Baranger, HU, Quantum Phase Transitions of Hard-Core Bosons in Background Potentials, Phys. Rev. Lett., vol. 97 no. 11 (2006), pp. 115703, ISSN 0031-9007 [17025902], [doi]
   (last updated on 2026/01/15)

   Abstract:
   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.