超导体和带电超流体的低洼集体激励

IF 1.9 Q3 PHYSICS, CONDENSED MATTER Condensed Matter Pub Date : 2023-05-03 DOI:10.3390/condmat8020042
S. Klimin, J. Tempère, H. Kurkjian
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引用次数: 0

摘要

我们从理论上研究了超导体和带电超流体在BCS-BEC交叉状态下的低洼集体激励的动量依赖频率和阻尼。本文基于高斯对-密度涨落方法研究了高斯对-密度场涨落的传播子。特征频率和阻尼率以相互一致的非扰动方式确定为波动传播子的复极点。特别注意的是新的特点,相对于以前的理论研究,这是专门为超导体的集体激发在远BCS制度。我们发现,在足够强的耦合下,出现了新的集体激励分支,它们作为动量和温度的函数表现出不同的行为。
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Low-Lying Collective Excitations of Superconductors and Charged Superfluids
We investigate theoretically the momentum-dependent frequency and damping of low-lying collective excitations of superconductors and charged superfluids in the BCS–BEC crossover regime. The study is based on the Gaussian pair-and-density fluctuation method for the propagator of Gaussian fluctuations of the pair and density fields. Eigenfrequencies and damping rates are determined in a mutually consistent nonperturbative way as complex poles of the fluctuation propagator. Particular attention is paid to new features with respect to preceding theoretical studies, which were devoted to collective excitations of superconductors in the far BCS regime. We find that at a sufficiently strong coupling, new branches of collective excitations appear, which manifest different behavior as functions of the momentum and the temperature.
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来源期刊
Condensed Matter
Condensed Matter PHYSICS, CONDENSED MATTER-
CiteScore
2.90
自引率
11.80%
发文量
58
审稿时长
10 weeks
期刊最新文献
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