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arXiv 2504.03482cond-mat.quant-gascond-mat.stat-mechphysics.comp-phquant-ph
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二维软核玻色子在有限温度下的超流体相

Supersolid phase in two-dimensional soft-core bosons at finite temperature

Aalto University(阿尔托大学);Università di Camerino(卡梅里诺大学);INFN, Sezione di Perugia(意大利国家核物理研究所佩鲁伽分部);CNR-INO(意大利国家研究委员会光学研究所);Università di Trento(特伦托大学)

Sebastiano Peotta, Gabriele Spada, Stefano Giorgini, Sebastiano Pilati, Alessio Recati

AI总结:

研究二维软核玻色子的超流体相,通过自洽Hartree-Fock和量子蒙特卡洛方法,揭示低温下超流体相与正常准晶体相的分离区域及可能的六边形相。

摘要:

通过自洽Hartree-Fock和量子蒙特卡洛方法研究二维软核玻色子的超流体相。首先利用平均场方法构建有限温度下的近似相图,随后通过精确路径积分模拟验证,实现各相的微观表征。通过超流密度和关联函数的长程行为分析超流和熔化/冻结转变,符合Berezinskii-Kosterlitz-Thouless转变的一般图景。在低温区域发现超流体相存在,将均匀超流相与正常准晶体相分隔。此外,在正常固相与流体相之间发现一个潜在的六边形相,具有准长程取向序。这些发现表明自洽Hartree-Fock理论超越局部密度近似是一种有效的工具,补充了计算强度大的量子蒙特卡洛模拟,用于研究超流体相的熔化及可能的六边形超流体相在不同相互作用势下的出现。

英文摘要:

The supersolid phase of soft-core bosons in two dimensions is investigated using the self-consistent Hartree-Fock and quantum Monte Carlo methods. An approximate phase diagram at finite temperatures is initially constructed using the mean-field approach, which is subsequently validated through precise path-integral simulations, enabling a microscopic characterization of the various phases. Superfluid and melting/freezing transitions are analyzed through the superfluid density and the long-range behavior of correlation functions associated with positional and orientational order, in accordance with the general picture of Berezinskii-Kosterlitz-Thouless transitions. A broad region at low temperatures is identified where the supersolid phase exists, separating the uniform superfluid phase from the normal quasi-crystal phase. Additionally, a potential intermediate hexatic phase with quasi long-range orientational order is identified in a narrow region between the normal solid and fluid phases. These findings establish self-consistent Hartree-Fock theory beyond the local density approximation as an effective tool, complementary to computationally intensive quantum Monte Carlo simulations, for investigating the melting of the supersolid phase and the possible emergence of the hexatic superfluid phase in bosonic systems with various interaction potentials.

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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