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arXiv 0901.0018cond-mat.supr-concond-mat.other
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由捕获气体密度求体相系统的phase diagram和热力学量

Obtaining phase diagram and thermodynamic quantities of bulk systems from the densities of trapped gases

Tin-Lun Ho, Qi Zhou

摘要:

目前,许多实验室正在进行实验,以模拟强关联系统的理论模型,使用冷原子在光晶格中,一个程序被称为“量子模拟“。希望这些实验能对凝聚态物理中一些长期存在的问题有所启发。量子模拟的目标是获得均匀体系统的信息。然而,实验是在封闭的陷阱中进行的。捕获电势的不均匀性不可避免地在样品中引入不同的相,使得难以推断单个体相的性质。到目前为止,还没有算法可以利用实验数据绘制相图和重要的热力学量。在这里,我们提出了一个算法来实现这一目标。除相图外,还绘制了超流体的熵密度、超流密度和反铁磁体的交错磁化。在局域密度近似下,我们的方案是精确的。

英文摘要:

At present, many laboratories are performing experiments to simulate theoretical models of strongly correlated systems using cold atoms in optical lattices, a program referred to as "Quantum Simulation". It is hoped that these experiments will shed light on some long standing problems in condensed matter physics. The goal of Quantum Simulation is to obtain information of homogenous bulk systems. However, experiments are performed in confining traps. The non-uniformity of the trapping potential inevitably introduces different phases in the sample, making it difficult to deduce the properties of a single bulk phase. So far, there are no algorithms to use the experimental data to map out phase diagrams and important thermodynamic quantities. Here, we present an algorithm to achieve this goal. Apart from phase diagram, it also maps out entropy density, superfluid density of superfluids, and staggered magnetizations of anti-ferromagnets. Our scheme is exact within local density approximation.

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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