Clustering and phase transitions in a 2D superfluid with immiscible active impurities

Clustering and phase transitions in a 2D superfluid with immiscible active impurities
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具有不混溶活性杂质的二维超流体中的聚类和相变

DOI:
10.1088/1751-8121/ab2607
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发表时间:
2019
期刊:
Mathematical and Theoretical
影响因子:
--
通讯作者:
Giuriato U
Giuriato U
中科院分区:
--
文献类型:
--
作者:
Giuriato U

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使用投影 Gross-Pitaevskii 模型研究了存在活性杂质时有限尺寸二维玻色子超流体的相变。杂质用经典自由度来描述。观察到热化过程中杂质的自发聚集。根据杂质之间的相互作用,这种簇可能会由于冷凝部分仍然很重要的温度下的热波动而破裂。发现团簇的出现提高了缩合转变温度。通过数值测定,发现冷凝温度和 Berezinskii-Kosterlitz-Thouless 转变温度强烈依赖于杂质所占据的体积:观察到它们各自的值相对增加到 a,而它们的比率保持近似恒定。
Phase transitions of a finite-size two-dimensional superfluid of bosons in presence of active impurities are studied by using the projected Gross–Pitaevskii model. Impurities are described with classical degrees of freedom. A spontaneous clustering of impurities during the thermalization is observed. Depending on the interaction among impurities, such clusters can break due to thermal fluctuations at temperatures where the condensed fraction is still significant. The emergence of clusters is found to increase the condensation transition temperature. The condensation and the Berezinskii–Kosterlitz–Thouless transition temperatures, determined numerically, are found to strongly depend on the volume occupied by the impurities: a relative increase up to a of their respective values is observed, whereas their ratio remains approximately constant.
延迟湍流玻色爱因斯坦凝聚热化的色散瓶颈。
DOI: --
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影响因子: 8.6
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