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arXiv 2108.01545cond-mat.supr-concond-mat.mtrl-sci
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$j=3/2$超导体中的内禀有限能量库珀对

Intrinsic finite-energy Cooper pairing in $j=3/2$ superconductors

Masoud Bahari, Song-Bo Zhang, Björn Trauzettel

摘要:

我们发现,库珀配对可以发生本质上远离费米面的$j=3/2$超导体具有强的自旋-轨道耦合和正常状态下同样弯曲的带。与传统的自旋- $1/2$电子之间的配对不同,我们推导出具有不同磁量子数的带间电子之间可以发生配对,例如$m_j=1/2$和$m_j=3/2$。在有限的激发能下,这种超导关联通过一对间接的类间隙结构来表现。这种奇异配对的一个可观察到的特征是在有限能量的态密度中出现了一对对称的超导相干峰。此外,在微扰塞曼场存在下的角动量分辨态密度反映了库珀对的$m_j$组成。我们认为,这种有限能量配对是一个通用的功能$j=3/2$超导体,无论是在存在和不存在的反转对称。

英文摘要:

We show that Cooper pairing can occur intrinsically away from the Fermi surface in $j=3/2$ superconductors with strong spin-orbit coupling and equally curved bands in the normal state. In contrast to conventional pairing between spin-$1/2$ electrons, we derive that pairing can happen between inter-band electrons having different magnetic quantum numbers, for instance, $m_j=1/2$ and $m_j=3/2$. Such superconducting correlations manifest themselves by a pair of indirect gap-like structures at finite excitation energies. An observable signature of this exotic pairing is the emergence of a pair of symmetric superconducting coherence peaks in the density of states at finite energies. Moreover, the angular-momentum-resolved density of states in the presence of a perturbative Zeeman field reflects the $m_j$ composition of the Cooper pairs. We argue that such finite-energy pairing is a generic feature of $j=3/2$ superconductors, both in presence and absence of inversion symmetry.

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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