Publications [#245110] of Harold U. Baranger

Papers Published
  1. Priyadarshee, A; Chandrasekharan, S; Lee, J-W; Baranger, HU, Quantum phase transitions of hard-core bosons in background potentials., Physical Review Letters, vol. 97 no. 11 (September, 2006), pp. 115703 [17025902], [doi] .

    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.