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arXiv 1003.4059cond-mat.quant-gasquant-ph
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双势阱中的玻色子:在简单模型中理解无序和相互作用之间的相互作用

Bosons in a double-well potential: Understanding the interplay between disorder and interaction in a simple model

Qi Zhou, S. Das Sarma

摘要:

我们提出了一个精确可解的模型来揭示玻色子系统中相互作用和无序之间相互作用的物理机制。考虑双势阱中的相互作用玻色子,其中无序是通过将两个势阱之间的能级失配随机分布来模拟的,我们发现“两负一正”效应。虽然无序或相互作用本身抑制了两个阱之间的相位相干性,但两者一起增强了相位相干性。这个模型还捕捉到了最近数值模拟中发现的无序玻色-哈伯德模型的几个显著特征。有限温度下的结果可能有助于解释为什么最近的实验没有发现任何证据表明无序玻色子系统中的相位相干性增强。

英文摘要:

We propose an exactly solvable model to reveal the physics of the interplay between interaction and disorder in bosonic systems. Considering interacting bosons in a double-well potential, in which disorder is mimicked by taking the energy level mismatch between the two wells to be randomly distributed, we find "two negatives make a positive" effect. While disorder or interaction by itself suppresses the phase coherence between the two wells, both together enhance the phase coherence. This model also captures several striking features of the disordered Bose-Hubbard model found in recent numerical simulations. Results at finite temperatures may help explain why a recent experiment did not find any evidence for the enhancement of phase coherence in a disordered bosonic system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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