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arXiv 1010.4136cond-mat.supr-concond-mat.str-el
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正常金属与FFLO超导体II之间的Andreev反射:自洽方法

Andreev reflection between a normal metal and the FFLO superconductor II: a self-consistent approach

J. Kaczmarczyk, M. Sadzikowski, J. Spałek

摘要:

本文研究了Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)态的Fulde-Ferrell(FF)型重费米子超导体与正常金属二维结中的Andreev反射。假设超导能隙具有s波对称性。超导体的参数:带隙大小,化学势,和库珀对质心动量Q,都是在平均场(BCS)计划自洽确定。选择库珀对动量Q垂直于结界面。我们计算了一系列势垒强度的结电导。在入射电子自旋σ= 1的情况下,仅当磁场接近上临界场H_{c2}时,我们得到了所谓的Andreev窗口,即反射概率最大的能量区间,这反过来又由电导的峰值表示。最后的结果与文献中存在的其他非自洽计算不同。

英文摘要:

We consider Andreev reflection in a two dimensional junction between a normal metal and a heavy fermion superconductor in the Fulde-Ferrell (FF) type of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We assume s-wave symmetry of the superconducting gap. The parameters of the superconductor: the gap magnitude, the chemical potential, and the Cooper pair center-of-mass momentum Q, are all determined self-consistently within a mean-field (BCS) scheme. The Cooper pair momentum Q is chosen as perpendicular to the junction interface. We calculate the junction conductance for a series of barrier strengths. In the case of incoming electron with spin σ= 1 only for magnetic fields close to the upper critical field H_{c2}, we obtain the so-called Andreev window i.e. the energy interval in which the reflection probability is maximal, which in turn is indicated by a peak in the conductance. The last result differs with other non-self-consistent calculations existing in the literature.

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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