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arXiv 1111.6778cond-mat.quant-gas
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成对超流体之间的离散对称破缺跃迁

Discrete Symmetry Breaking Transitions Between Paired Superfluids

M. J. Bhaseen, S. Ejima, F. H. L. Essler, H. Fehske, M. Hohenadler, B. D. Simons

摘要:

研究了一维玻色子通过Feshbach共振对相互作用的零温相图。利用密度矩阵重整化群和场论技术,我们描述了在这种低维环境中的相位和量子相变。我们提供了广泛的证据支持伊辛量子相变分离不同的成对超流体,包括能隙,关联函数和纠缠熵的结果。特别是,我们表明,伊辛关联长度,序参量和临界性质是直接从原子和分子的两点函数的比率。我们进一步证明了零动量占据数和可见度都与不存在纯原子超流相一致。我们评论的连接到最近的研究玻色子配对在一个广义的经典XY模型。

英文摘要:

We explore the zero-temperature phase diagram of bosons interacting via Feshbach resonant pairing interactions in one dimension. Using DMRG (Density Matrix Renormalization Group) and field theory techniques we characterize the phases and quantum phase transitions in this low-dimensional setting. We provide a broad range of evidence in support of an Ising quantum phase transition separating distinct paired superfluids, including results for the energy gaps, correlation functions and entanglement entropy. In particular, we show that the Ising correlation length, order parameter and critical properties are directly accessible from a ratio of the atomic and molecular two-point functions. We further demonstrate that both the zero-momentum occupation numbers and the visibility are in accordance with the absence of a purely atomic superfluid phase. We comment on the connection to recent studies of boson pairing in a generalized classical XY model.

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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