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arXiv 2510.02460cond-mat.str-el
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通过超导接头检测Kitaev模型中的量子自旋液体

Detecting quantum spin liquid on Kitaev model through a superconducting junction

Universidade Federal de Viçosa(维索卡联邦大学)

A. R. Moura, L. V. Santos

AI总结:

通过超导接头检测Kitaev模型中的量子自旋液体,揭示其独特的自旋电流特性。

摘要:

Kitaev模型属于一类非传统的二维自旋系统,其特征是各向异性和键依赖性的相互作用,能够产生量子自旋液体(QSL)状态。这些奇特的相态,即使在零温度下也不存在磁序,支持分数化的激发和涌现的规范场。Kitaev模型特别吸引人之处在于其精确可解性,这揭示了低能激发以它inerantMajorana费米子-准粒子的形式出现,这些准粒子遵循非阿贝尔统计,是拓扑量子计算的核心关注对象,因其内在的抗局部扰动和退相干能力而备受关注。尽管理论进展广泛,但实验识别QSLs仍然具有挑战性,因为传统磁性探针无法检测其定义性质。在本文中,我们提出了一个关于从超导金属向Kitaev量子自旋液体注入自旋电流的理论研究。通过采用自旋电子学框架,我们推导了注入自旋电流的动力学,并展示了其特征如何追溯到自旋液体相中的Majorana激发。超导性在这一背景下起着关键作用,不仅作为相干准粒子的来源,也作为与拓扑量子设备接口的平台。我们的分析对比了Kitaev-超导接头与传统铁磁接头,后者自旋传输由磁子携带,并突显了自旋电流响应中的独特特征。这些发现为QSLs的检测开辟了新方向,并有助于将拓扑量子材料整合到可扩展的量子技术中。

英文摘要:

The Kitaev model belongs to an unconventional class of two-dimensional spin systems characterized by anisotropic, bond-dependent interactions that give rise to Quantum Spin Liquid (QSL) states. These exotic phases, marked by the absence of magnetic ordering even at zero temperature, support fractionalized excitations and emergent gauge fields. A particularly compelling feature of the Kitaev model is its exact solvability, which reveals low-energy excitations in the form of itinerant Majorana fermions-quasiparticles that obey non-Abelian statistics and are of central interest in topological quantum computation due to their inherent robustness against local perturbations and decoherence. Despite extensive theoretical advancements, the experimental identification of QSLs remains challenging, as conventional magnetic probes fail to detect their defining properties. In this work, we present a theoretical investigation of spin current injection from a superconducting metal into a Kitaev quantum spin liquid. By employing a spintronic framework, we derive the dynamics of the injected spin current and demonstrate how its signatures can be traced back to the underlying Majorana excitations in the spin liquid phase. Superconductivity plays a pivotal role in this context, not only as a source of coherent quasiparticles but also as a platform with potential for interfacing with topological quantum devices. Our analysis contrasts the Kitaev-superconductor interface with conventional ferromagnetic junctions, where spin transport is carried by magnons, and highlights distinctive features in the spin current response. These findings open new directions for the detection of QSLs and contribute to the broader effort of integrating topological quantum materials into scalable quantum technologies.

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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