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arXiv 2201.11749cond-mat.str-elcond-mat.dis-nncond-mat.quant-gas
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二维 Aubry-André 模型中宏观超流性与绝缘性的障碍

Barriers to Macroscopic Superfluidity and Insulation in a 2D Aubry-André Model

Dean Johnstone, Patrik Öhberg, Callum W. Duncan

AI总结:

本文利用平均场渗流分析研究二维 Aubry-André 势中相互作用玻色子的基态,揭示弱调制区域阻碍宏观超流或绝缘相形成并产生由少数区域主导的混合相。

摘要:

我们研究了在二维 Aubry-André 势存在下相互作用玻色子的基态相。通过使用平均场渗流分析,我们聚焦于二维 Aubry-André 模型的若干超晶格和准晶态区域,包括考虑势的倾斜或偏斜的推广形式。我们表明,宏观相起始的障碍自然产生于二维 Aubry-André 模型中的弱调制区域。这导致混合相的形成,其中宏观性质由系统的少数部分主导。因此,与晶体系统相比,相图呈现出显著不同的特征,包括 Bose glass 的叶状或波状外观、尖锐的突出部以及具有弱渗流的扩展区域。通过在多个区域研究二维 Aubry-André 模型,我们已经表明混合相的独特性质并非仅为一小部分参数所特有。

英文摘要:

We study the ground state phases of interacting bosons in the presence of a 2D Aubry-André potential. By using a a mean-field percolation analysis, we focus on several superlattice and quasicrystalline regimes of the 2D Aubry-André model, including generalisations that account for a tilting or skewing of the potential. We show that barriers to the onset of macroscopic phases naturally arise from weakly modulated domains in the 2D Aubry-André model. This leads to the formation of mixed phases, in which the macroscopic properties are dominated by a minority of the system. The phase diagrams then exhibit substantially different features when compared against crystalline systems, including a lobe-like or wave-like appearance of the Bose glass, sharp extrusions and extended domains with weak percolation. By studying the 2D Aubry-André model across multiple regimes, we have shown that the unique properties of mixed phases are not distinct to a small set of parameters.

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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