P-wave Pairing Near a Spin-Split Josephson Junction

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED
Rubén Seoane Souto, Dushko Kuzmanovski, Ignacio Sardinero, Pablo Burset, Alexander V. Balatsky
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Abstract

Superconductivity and magnetism are competing effects that can coexist in certain regimes. Their co-existence leads to unexpected new behaviors that include the onset of exotic electron pair mechanisms and topological phases. In this work, we study the properties of a Josephson junction between two spin-split superconductors. The spin-splitting in the superconductors can arise from either the coupling to a ferromagnetic material or an external magnetic field. The properties of the junction are dominated by the Andreev bound states that are also split. One of these states can cross the superconductor’s Fermi level, leading to a ground-state transition characterized by a suppressed supercurrent. We interpret the supercurrent blockade as coming from a dominance of p-wave pairing close to the junction, where the electrons are at both sides. To support this interpretation, we analyze the different pairing channels and show that p-wave pairing is favored in the case where the magnetization of the two superconductors is parallel and suppressed in the anti-parallel case. We also analyze the noise spectrum that shows signatures of the ground-state transition in the form of an elevated zero-frequency noise.

Abstract Image

自旋分裂约瑟夫森结附近的 P 波配对
超导和磁性是两种相互竞争的效应,在某些情况下可以共存。它们的共存会导致意想不到的新行为,包括奇异电子对机制和拓扑相的出现。在这项工作中,我们研究了两个自旋分裂超导体之间约瑟夫森结的特性。超导体中的自旋分裂可能源于与铁磁材料或外部磁场的耦合。交界处的特性由同样分裂的安德烈耶夫束缚态主导。其中一个态可以跨越超导体的费米级,导致以抑制超电流为特征的基态转变。我们将这种超电流阻滞解释为,在电子处于两侧的结点附近,p 波配对占主导地位。为了支持这一解释,我们分析了不同的配对通道,结果表明,在两个超导体磁化平行的情况下,p 波配对占优势,而在反平行的情况下,p 波配对则受到抑制。我们还分析了噪声频谱,它以零频噪声升高的形式显示了基态转变的特征。
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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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