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