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arXiv 1403.3259cond-mat.supr-concond-mat.stat-mech
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熵和流诱导超流态

Entropy- and Flow- Induced Superfluid States

J. Carlstrom, E. Babaev

摘要:

通常情况下,超流体和超导体中相位涨落的作用是驱动相变到正常状态。这是由于扩散的拓扑非平凡的相位波动的形式的旋涡。在这里,我们讨论一类系统,相比之下,非拓扑相位波动可以产生超流性。在这里,我们将超流性理解为一种现象,它不一定是由$U(1)$对称性破缺引起的,但可以与系统能量景观的某类(近似或精确)简并相关联,从而产生类似$U(1)$的相。

英文摘要:

Normally the role of phase fluctuations in superfluids and superconductors is to drive a phase transition to the normal state. This happens due to proliferation of topologically nontrivial phase fluctuations in the form of vortices. Here we discuss a class of systems where, by contrast, nontopological phase fluctuations can produce superfluidity. Here we understand superfluidity as a phenomenon that does not necessarily arises from a broken $U(1)$ symmetry, but can be associated with a certain class of (approximate or exact) degeneracies of the systems energy landscape giving raise to a $U(1)$-like phase.

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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