安德列夫反射
凝聚态物理
超导电性
联轴节(管道)
动量(技术分析)
物理
自旋(空气动力学)
各向异性
反射(计算机编程)
振幅
电子
角动量
量子力学
材料科学
计算机科学
程序设计语言
财务
经济
冶金
热力学
作者
Zhi Ping Niu,Yong Mei Zhang
标识
DOI:10.1088/1361-6668/ad3f56
摘要
Abstract Altermagnets are a novel class of magnetic materials with a significant non-relativistic spin splitting band structure but zero net macroscopic magnetization. We here investigate the interplay between altermagnetism and superconductivity and how the band structures of the altermagnet affect nonlocal transport across altermagnet/superconductor/altermagnet junctions. The two types of spin-momentum coupling: anisotropic and valley-dependent spin-momentum couplings are considered. The pure crossed Andreev reflection (CAR) can be observed by tuning the chemical potential and a switch effect between pure CAR and pure electron elastic cotunneling (EC) can be realized by reversing the Néel vector of the right altermagnet. For the anisotropic spin-momentum coupling, increasing the altermagnetism strength decreases the amplitude of EC while increases that of CAR. Furthermore, a switch between pure EC and pure CAR is predicted for the Néel vectors of the altermagnets in the parallel configuration for the valley-dependent spin-momentum coupling by tuning the on-site energy.
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