d波反常磁体/超导体异质结构中可扭曲调控的顺磁超导性
Twist-Tunable Paramagnetic Superconductivity in $d$-wave Altermagnet/Superconductor Heterostructures
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中文总结 AI 辅助
该研究通过理论分析d波反常磁体/超导体异质结构，利用扭曲角调控动量空间节点失配，实现了奇频自旋三重态配对及可切换的顺磁/抗磁超导相，为超导量子调控提供了新平台。
中文摘要 AI 辅助
扭曲角工程与非常规磁性的相互作用为调控量子现象提供了强大新途径。我们从理论上研究了由二维d波反常磁体邻近耦合的d波超导体构成的异质结构，发现超导能隙节点与反常磁体自旋分裂节点之间的动量空间失配会产生鲁棒的、可扭曲调控的奇频自旋三重态配对。因此，系统的宏观电磁响应可通过界面扭曲角从常规抗磁迈斯纳态调控至完全由界面扭曲角驱动的反常顺磁迈斯纳效应。对于d_{x²-y²}型反常磁体，顺磁响应在完全对齐（φ=0）时达到最大，在最大扭曲φ=π/4时完全被抑制；而d_{xy}型反常磁体则表现出完全互补的行为。我们的结果确立了扭曲反常磁体异质结构作为工程奇频配对和宏观超导相的通用平台。
英文摘要
The interplay between twist-angle engineering and unconventional magnetism provides a powerful new route to control quantum phenomena. We theoretically investigate a heterostructure comprising a $d$-wave superconductor proximitized by a two-dimensional $d$-wave altermagnet. We reveal that the momentum-space mismatch between the superconducting gap nodes and the altermagnetic spin-splitting nodes generates a robust, twist-tunable odd-frequency spin-triplet pairing. Consequently, the macroscopic electromagnetic response of the system can be tuned from a conventional diamagnetic Meissner state to an anomalous paramagnetic Meissner effect driven entirely by the interfacial twist angle. For a $d_{x^2-y^2}$ altermagnet, the paramagnetic response is maximized at perfect alignment ($ϕ=0$) and completely suppressed at a maximal twist of $ϕ=π/4$, while a $d_{xy}$ altermagnet exhibits the exact complementary behavior. Our results establish twisted altermagnetic heterostructures as a versatile platform for engineering odd-frequency pairing and macroscopic superconducting phases.
发表机构
- Institute for Advanced Studies in Basic Sciences (IASBS)（基础科学高等研究院）
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