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首页> 外文期刊>Physica, C. Superconductivity and its applications >Simplified approach of investigation of binding energy for fermionic pairing in two dimensional Fermi liquid type superconducting materials at finite low temperature
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Simplified approach of investigation of binding energy for fermionic pairing in two dimensional Fermi liquid type superconducting materials at finite low temperature

机译:二维Fermi液体型超导材料在有限低温下对铁饼配对结合能力的简化方法

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摘要

Relation between the binding energy of pair of fermions and the magnitude of the attractive interaction between them is investigated theoretically with the help of mean field approximation, for a two-dimensional (2D) Fermi liquid type superconducting material. Here the fermion pair has finite center of mass momentum (CMM). The fermion pair is considered to be formed in the presence of an active Fermi sea having multiple pairs with inclusion of the effect of Pauli exclusion principle, at finite low temperature. Our calculations show that coexistence of true bound state (TB) and Cooper pair state (CP) with various CMMs can occur only beyond a critical attractive interaction strength which is similar to the results obtained at T = 0 K[1]. We establish that Coopers pair state to true bound state crossover can be possible to achieve controlling the value of CMM of the fermion pairs. This could lead to the well-studied phenomena Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein Condensed (BEC) crossover and also the formation of incoherent pairs, under strong coupling regime. This throws a significant emphasis on the normal state anomalies seen in some of the exotic superconductors.
机译:在平均场近似下,从理论上研究了二维费米液体型超导材料中费米子对的结合能与吸引相互作用大小之间的关系。这里,费米子对具有有限的质心动量(CMM)。费米子对被认为是在有限低温下,在包含泡利不相容原理效应的多对活跃费米海中形成的。我们的计算表明,与各种CMM共存的真束缚态(TB)和库珀对态(CP)只能超过临界吸引相互作用强度,这与在T=0 K[1]时获得的结果类似。我们证明了库珀对态到真束缚态的交叉可以实现费米子对CMM值的控制。这可能会导致巴丁·库珀·施里弗(Bardeen Cooper-Schrieffer,BCS)到玻色-爱因斯坦凝聚(Bose-Einstein Congregated,BEC)的交叉现象,以及在强耦合区下非相干对的形成。这突出了一些奇异超导体中正常状态异常的重要性。

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