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arXiv 2103.04164cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
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二维层状超导体中涡旋束缚态与磁性杂质的相干耦合

Coherent coupling between vortex bound states and magnetic impurities in 2D layered superconductors

Sunghun Park, Vıctor Barrena, Samuel Mañas-Valero, José J. Baldoví, Antón Fente, Edwin Herrera, Federico Mompeán, Mar García-Hernández, Ángel Rubio, Eugenio Cor… 展开作者

Sunghun Park, Vıctor Barrena, Samuel Mañas-Valero, José J. Baldoví, Antón Fente, Edwin Herrera, Federico Mompeán, Mar García-Hernández, Ángel Rubio, Eugenio Coronado, Alfredo Levy Yeyati, Hemann Suderow

摘要:

超导体中的束缚态被期望表现出空间分辨的电子-空穴不对称性,这是它们量子性质的标志。这种不对称性表现为费米波长处的振荡,费米波长通常很小,因此会被热加宽或缺陷处的散射所消除。在这里,我们从理论上证明和实验证实,当耦合到磁性杂质,在涡核中的束缚态表现出一个新兴的轴向电子空穴的不对称性在一个更长的尺度上,设置的相干长度。我们研究了2 H-NbSe $_2$和2 H-NbSe $_{1.8}$ S_{0.2} $磁性杂质中的涡旋,用详细的Hubbard校正的密度泛函计算表征这些。我们发现,诱导的电子-空穴不平衡依赖于超导材料的能带特性。我们的结果为耦合超导束缚态的研究开辟了有趣的前景。

英文摘要:

Bound states in superconductors are expected to exhibit a spatially resolved electron-hole asymmetry which is the hallmark of their quantum nature. This asymmetry manifests as oscillations at the Fermi wavelength, which is usually tiny and thus washed out by thermal broadening or by scattering at defects. Here we demonstrate theoretically and confirm experimentally that, when coupled to magnetic impurities, bound states in a vortex core exhibit an emergent axial electron-hole asymmetry on a much longer scale, set by the coherence length. We study vortices in 2H-NbSe$_2$ and in 2H-NbSe$_{1.8}$S_{0.2}$ with magnetic impurities, characterizing these with detailed Hubbard-corrected density functional calculations. We find that the induced electron-hole imbalance depends on the band character of the superconducting material. Our results open interesting prospects for the study of coupled superconducting bound states.

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