arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2511.04480cond-mat.supr-concond-mat.mes-hall
收藏

准二维层状超导体中临界面内磁场上限

Upper critical in-plane magnetic field in quasi-2D layered superconductors

National High Magnetic Field Laboratory(国家强磁场实验室);Florida State University(佛罗里达州立大学);Washington University in St. Louis(华盛顿大学圣路易斯分校)

Huiyang Ma, Dmitry V. Chichinadze, Cyprian Lewandowski

AI总结:

本文提出分析多层超导体中临界面内磁场上限数据的框架,通过考虑自旋单态和自旋三态配对,研究Hc2-Tc临界曲线与实验参数的关系,揭示Bernal双层石墨烯实验中自旋轨道参数的异常。

摘要:

研究外部磁场与超导性相互作用的进展得益于最近对伯恩特双层和菱形多层石墨烯的研究。这些研究,无论是否具有近邻自旋轨道耦合,都为探索非常规超导体开辟了新前沿,因为它们提供了独特的平台来研究具有高面内磁场鲁棒性和甚至磁场诱导超导性的超导性。本文提出一个分析多层超导体中临界面内磁场数据的框架。该框架基于一个可解析的超导配对模型,该模型捕捉了这些系统的正常态现象,并应用于计算临界磁场Hc2与相应临界温度Tc之间的关系。我们研究Hc2-Tc临界曲线作为实验参数(Ising和Rashba自旋轨道耦合)和去配对机制(Zeeman和轨道耦合)函数,对于自旋单态和自旋三态配对。通过将该框架应用于分析四个最近的伯恩特双层石墨烯-WSe2实验[1-4],我们识别出拟合和测量自旋轨道参数之间的明显差异,我们提出这可以由伯恩特双层石墨烯实验中Landé g因子的增强来解释。

英文摘要:

The study of the interplay of applied external magnetic field and superconductivity has been invigorated by recent works on Bernal bilayer and rhombohedral multilayer graphene. These studies, with and without proximitized spin-orbit coupling, have opened up a new frontier in the exploration of unconventional superconductors as they offer a unique platform to investigate superconductivity with high degree of in-plane magnetic field resilience and even magnetic field-induced superconductivity. Here, we present a framework for analyzing the upper critical in-plane magnetic field data in multilayer superconductors. Our framework relies on an analytically tractable superconducting pairing model that captures the normal state phenomenology of these systems and applies it to calculate the relationship between the upper critical field $H_{c2}$ and the corresponding critical temperature $T_{c}$. We study the $H_{c2}-T_{c}$ critical curve as a function of experimental parameters (Ising and Rashba spin-orbit coupling) and depairing mechanisms (Zeeman and orbital coupling) for both spin-singlet and spin-triplet pairing. By applying our framework to analyze four recent Bernal bilayer graphene-WSe$_2$ experiments [1-4], we identify an apparent discrepancy between fitted and measured spin-orbit parameters, which we propose can be explained by an enhancement of the Landé g factor in the Bernal bilayer graphene experiments.

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。

↑