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Quantum phase transitions of hard-core bosons in background potentials
Authors:Priyadarshee Anand  Chandrasekharan Shailesh  Lee Ji-Woo  Baranger Harold U
Institution:Department of Physics, Box 90305, Duke University, Durham, North Carolina 27708-0305, USA.
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.
Keywords:
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