Balabanyan Karén G, Prokof'ev Nikolay, Svistunov Boris
Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Phys Rev Lett. 2005 Jul 29;95(5):055701. doi: 10.1103/PhysRevLett.95.055701. Epub 2005 Jul 25.
We study the nature of the superfluid-insulator quantum phase transition in a one-dimensional system of lattice bosons with off-diagonal disorder in the limit of a large integer filling factor. Monte Carlo simulations of two strongly disordered models show that the universality class of the transition in question is the same as that of the superfluid-Mott-insulator transition in a pure system. This result can be explained by disorder self-averaging in the superfluid phase and the applicability of the standard quantum hydrodynamic action. We also formulate the necessary conditions which should be satisfied by the stong-randomness universality class, if one exists.
我们研究了在大整数填充因子极限下，具有非对角无序的一维晶格玻色子系统中，超流体 - 绝缘体量子相变的性质。对两个强无序模型的蒙特卡罗模拟表明，所讨论的相变的普适类与纯系统中超流体 - 莫特绝缘体相变的普适类相同。这一结果可以通过超流相中的无序自平均以及标准量子流体动力学作用的适用性来解释。我们还阐述了如果存在强无序普适类，则其应满足的必要条件。
