Density of states spectra in ferromagnet/superconductor/ferromagnet heterostructures
Density of states spectra in ferromagnet/superconductor/ferromagnet heterostructures
复制标题
铁磁体/超导体/铁磁体异质结构中的态密度谱
DOI：
10.1103/physrevb.83.214506
复制
发表时间：
2011-06
影响因子：
3.7
通讯作者：
Zhou, Shi-Ping
中科院分区：
文献类型：
--
作者：
Meng, Hao;Wen, Lin;Zha, Guo-Qiao;Zhou, Shi-Ping
我们通过将界面自旋翻转散射势加入到现有的平均场哈密顿量中来研究铁磁体/超导体/铁磁体结构的态密度（DOS）谱。我们发现自旋翻转散射可以导致FS界面附近的电子自旋混合，通过带内和带间的Andreev反射实现s波单线态和奇频三重态对的转换以及具有子隙能量（±eb）的Andreev束缚态的存在。这为DOS谱增加了自旋分辨的子隙峰。在±eb处的相关弹性共隧作用增强了局域电导，而它与交叉安德烈夫反射的竞争将导致非局域微分电导随偏置能量的变化。
We investigate density of states (DOS) spectra of a ferromagnet/superconductor/ferromagnet structure by including the interface spin-flip scattering potential into the existing mean-field Hamiltonian. We show that the spin-flip scattering can lead to electron spin mixing in the vicinity of an FS interface, enabling s-wave singlet and odd-frequency triplet pairs conversion and the existence of Andreev bound states with subgap energy (±eb) via the intra- and interband Andreev reflections. This adds spin-resolved subgap peaks to the DOS spectrum. The relevant elastic co-tunneling at ±eb enhances the local conductance, while its competition with the crossed Andreev reflection will lead to a sign change in the nonlocal differential conductance with the bias energy.