论文标题
非常规超导体中Andreev状态的热电检测
Thermoelectric detection of Andreev states in unconventional superconductors
论文作者
论文摘要
从理论上讲，我们描述了一种热电效应，该效应完全是由于Andreev过程涉及通过电子和孔的耦合而形成库珀对的。 Andreev的热电效应可能发生在弹道弹药 - 螺旋体 - 导管连接处，对铁磁铁具有显着的超导接近效应，并且对在非常规超导体中出现的表面状态非常敏感。我们考虑在两个和三个维度上的杂化连接，以证明在超导体表面的低能量Andreev结合状态下，热电电流总是反转。对接近度诱导的配对的显微镜分析表明，热电效应只有在混合单线和三重态状态下均匀且奇怪的频率库珀对共存时才会出现。我们的结果是结合磁性和超导性的系统中新兴现象的丰富性的一个例子，它们为在非常规超导体中探索外来表面状态开辟了途径。
We theoretically describe a thermoelectric effect that is entirely due to Andreev processes involving the formation of Cooper pairs through the coupling of electrons and holes. The Andreev thermoelectric effect can occur in ballistic ferromagnet-superconductor junctions with a dominant superconducting proximity effect on the ferromagnet, and it is very sensitive to surface states emerging in unconventional superconductors. We consider hybrid junctions in two and three dimensions to demonstrate that the thermoelectric current is always reversed in the presence of low-energy Andreev bound states at the superconductor surface. A microscopic analysis of the proximity-induced pairing reveals that the thermoelectric effect only arises if even and odd-frequency Cooper pairs coexist in mixed singlet and triplet states. Our results are an example of the richness of emergent phenomena in systems that combine magnetism and superconductivity, and they open a pathway for exploring exotic surface states in unconventional superconductors.
