Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
Phys Rev Lett. 2012 Dec 28;109(26):265303. doi: 10.1103/PhysRevLett.109.265303. Epub 2012 Dec 27.
We investigate the superfluid-insulator quantum phase transition of one-dimensional bosons with off-diagonal disorder by means of large-scale Monte Carlo simulations. For weak disorder, we find the transition to be in the same universality class as the superfluid-Mott insulator transition of the clean system. The nature of the transition changes for stronger disorder. Beyond a critical disorder strength, we find nonuniversal, disorder-dependent critical behavior. We compare our results to recent perturbative and strong-disorder renormalization group predictions. We also discuss experimental implications as well as extensions of our results to other systems.
我们通过大规模的蒙特卡罗模拟研究了一维玻色子的超流-绝缘量子相变，其中存在非对角无序。对于较弱的无序，我们发现该相变与清洁系统中超流-Mott 绝缘相变处于同一通用类别。随着无序的增强，相变的性质发生了变化。在超过一个临界无序强度之后，我们发现了非普适的、依赖于无序的临界行为。我们将我们的结果与最近的微扰和强无序重整化群预测进行了比较。我们还讨论了实验意义以及我们的结果对其他系统的扩展。
