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arXiv 0705.1634hep-phastro-phcond-mat.supr-connucl-th
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有限温度下相对论BCS-BEC渡越及其在色超导中的应用

Relativistic BCS-BEC Crossover at Finite Temperature and Its Application to Color Superconductivity

Lianyi He, Pengfei Zhuang

摘要:

将有限温度下BCS-BEC交叉的非相对论性$G_0 G$形式推广到相对论性费米子系统。未凝聚的电子对对费米子激发提供了赝能隙。该理论恢复了零温时的BCS平均场近似,并在适当的范围内恢复了非相对论性结果。对于有质量的费米子,当耦合强度增加时,存在从弱耦合BCS超流到非相对论BEC态和相对论BEC态的两次交叉。对于中等重子密度的色超导体,物质处于BCS-BEC交叉区,赝能隙的行为与高温超导体中的行为非常相似。

英文摘要:

The non-relativistic $G_0 G$ formalism of BCS-BEC crossover at finite temperature is extended to relativistic fermion systems. The uncondensed pairs contribute a pseudogap to the fermion excitations. The theory recovers the BCS mean field approximation at zero temperature and the non-relativistic results in a proper limit. For massive fermions, when the coupling strength increases, there exist two crossovers from the weak coupling BCS superfluid to the non-relativistic BEC state and then to the relativistic BEC state. For color superconductivity at moderate baryon density, the matter is in the BCS-BEC crossover region, and the behavior of the pseudogap is quite similar to that found in high temperature superconductors.

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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