局部玻色子如何成为超流体
How localized bosons manage to become superfluid
摘要：
我们通过一个非常简单的变分波函数研究了无序玻色-哈伯德模型中的超流-玻色玻璃化转变：变分确定的非正交单粒子波函数的永久性。通过超流刚度的行为来识别过渡。我们还介绍了一个不太严格，但非常有启发性的标准的过渡，这是有关的重叠矩阵之间的单粒子波函数，用于建立永久。我们发现这两个标准相当吻合。最后，我们考虑进一步的数量，二分纠缠熵，这也提供了一个很好的估计超流玻色玻璃化转变。
英文摘要：
We study the superfluid-to-Bose glass transition in a disordered Bose-Hubbard model through a very simple variational wavefunction: a permanent of non-orthogonal single-particle wavefunctions that are variationally determined. The transition is identified by the behavior of the superfluid stiffness. We also introduce a less rigorous but very enlightening criterium for the transition, which is related to the overlap matrix among the single-particle wavefunctions that are used to built the permanent. We find that the two criteria agree quite well. We finally consider a further quantity, the bipartite entanglement entropy, which also provides a good estimator for the superfluid-to-Bose glass transition.
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