Absence of a Direct Superfluid to Mott Insulator Transition in Disordered Bose Systems

作者：Pollet L^*; Prokof'ev N V; Svistunov B V; Troyer M

来源：Physical Review Letters, 2009, 103(14): 140402.

DOI：10.1103/PhysRevLett.103.140402

We prove the absence of a direct quantum phase transition between a superfluid and a Mott insulator in a bosonic system with generic, bounded disorder. We also prove the compressibility of the system on the superfluid-insulator critical line and in its neighborhood. These conclusions follow from a general theorem of inclusions, which states that for any transition in a disordered system, one can always find rare regions of the competing phase on either side of the transition line. Quantum Monte Carlo simulations for the disordered Bose-Hubbard model show an even stronger result, important for the nature of the Mott insulator to Bose glass phase transition: the c

• 出版日期2009-10-2