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arXiv 2301.00538cond-mat.str-el
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拓扑近藤超导体

Topological Kondo Superconductors

Yung-Yeh Chang, Khoe Van Nguyen, Kuang-Lung Chen, Yen-Wen Lu, Chung-Yu Mou, Chung-Hou Chung

摘要:

自旋三重态$p$波超导体是拓扑超导体的理想候选者。它们已经被提出在各种异质结构中,其中具有强自旋-轨道相互作用的材料通过邻近效应耦合到传统的$s$波超导体。然而,拓扑超导体存在于自然界中,并纯粹由强电子关联驱动,尚未得到研究。在这里,我们提出了一个实现这样的系统在一类近藤晶格材料的自旋轨道耦合和邻近效应的情况下。其中,奇宇称近藤杂化介导铁磁自旋-自旋耦合,并导致自旋-三重态共振价键($t$ -RVB)配对的本地的时刻。当近藤效应与$t$ -RVB共存时,得到自旋三重态$p\pm i p^\prime$波拓扑超导性。我们确定的非平凡拓扑不变量和Majorana费米子在边缘的拓扑性质。我们的研究结果提供了一个全面的理解UTe $_2$,一个U基铁磁重电子超导体的实验观察。

英文摘要:

Spin-triplet $p$-wave superconductors are promising candidates for topological superconductors. They have been proposed in various heterostructures where a material with strong spin-orbit interaction is coupled to a conventional $s$-wave superconductor by proximity effect. However, topological superconductors existing in nature and driven purely by strong electron correlations are yet to be studied. Here we propose a realization of such a system in a class of Kondo lattice materials in the absence of spin-orbit coupling and proximity effect. Therein, the odd-parity Kondo hybridization mediates ferromagnetic spin-spin coupling and leads to spin-triplet resonant-valence-bond ($t$-RVB) pairing between local moments. Spin-triplet $p\pm i p^\prime$-wave topological superconductivity is reached when Kondo effect co-exists with $t$-RVB. We identify the topological nature by the non-trivial topological invariant and the Majorana fermions at edges. Our results offer a comprehensive understanding of experimental observations on UTe$_2$, a U-based ferromagnetic heavy-electron superconductor.

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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