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arXiv 0910.4534cond-mat.dis-nncond-mat.quant-gas
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一维无序弱相互作用玻色子的有限温度相变

Finite temperature phase transition for disordered weakly interacting bosons in one dimension

I. L. Aleiner, B. L. Altshuler, G. V. Shlyapnikov

摘要:

人们普遍认为,在有限温度下的一维(1D)系统中不存在相变,因为长程关联被热涨落破坏了。在这里,我们证明了一维气体的短程相互作用玻色子在无序的存在下,可以进行有限的温度之间的相变两个不同的状态:流体和绝缘体。这些状态都没有长程空间相关性,但这是一个真实的,虽然非传统的相变,因为传输特性是奇异的过渡点。在流体相中,质量传输是可能的,而在绝缘体相中,即使在有限的温度下,质量传输也被完全阻断。从而揭示了无序玻色子之间的相互作用如何影响它们的安德森局域化。这个关键的问题,首先提出的电子在固体中,现在是至关重要的原子玻色子的研究,最近的实验已经证明了安德森局域化在扩展非常稀释的准一维云。

英文摘要:

It is commonly accepted that there are no phase transitions in one-dimensional (1D) systems at a finite temperature, because long-range correlations are destroyed by thermal fluctuations. Here we demonstrate that the 1D gas of short-range interacting bosons in the presence of disorder can undergo a finite temperature phase transition between two distinct states: fluid and insulator. None of these states has long-range spatial correlations, but this is a true albeit non-conventional phase transition because transport properties are singular at the transition point. In the fluid phase the mass transport is possible, whereas in the insulator phase it is completely blocked even at finite temperatures. We thus reveal how the interaction between disordered bosons influences their Anderson localization. This key question, first raised for electrons in solids, is now crucial for the studies of atomic bosons where recent experiments have demonstrated Anderson localization in expanding very dilute quasi-1D clouds.

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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