Universal superfluid transition and transport properties of two-dimensional dirty bosons.
Universal superfluid transition and transport properties of two-dimensional dirty bosons.
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二维脏玻色子的通用超流体跃迁和输运特性。
DOI：
10.1103/physrevlett.111.050406
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发表时间：
2013
影响因子：
8.6
通讯作者：
L. Sanchez
中科院分区：
文献类型：
--
作者：
Giuseppe Carleo;G. Boéris;M. Holzmann;L. Sanchez
利用有限温度下的大规模量子蒙特卡罗模拟，研究了连续空间中存在关联无序的二维相互作用玻色子的相图。我们证明了超流体相变受到强烈的无序保护。它仍然是Berezinskii-Kosterlitz-Thouless类型，直到无序强度与化学势相当。此外，我们还研究了零温玻色玻璃相存在的强无序区的输运性质。结果表明，只有在零温度下，电导才表现出热激活行为。我们的结果表明存在玻色不良金属相作为玻色玻璃相的先驱。
We study the phase diagram of two-dimensional, interacting bosons in the presence of a correlated disorder in continuous space, by using large-scale quantum Monte Carlo simulations at finite temperature. We show that the superfluid transition is strongly protected against disorder. It remains of the Berezinskii-Kosterlitz-Thouless type up to disorder strengths comparable to the chemical potential. Moreover, we study the transport properties in the strong disorder regime where a zero-temperature Bose-glass phase is expected. We show that the conductance exhibits a thermally activated behavior vanishing only at zero temperature. Our results point towards the existence of a Bose bad-metal phase as a precursor of the Bose-glass phase.