Tan Chuan, Wu Qingping, Li Haoran, Liu Zhengfang, Xiao Xianbo
Department of Applied Physics, East China Jiaotong University, Nanchang, 330013, China.
School of Computer, Jiangxi University of Chinese Medicine, Nanchang, 330004, China.
Sci Rep. 2025 Apr 21;15(1):13752. doi: 10.1038/s41598-025-98541-8.
We investigated the zero-bias conductance peak in a graphene-based ferromagnet/ferromagnet/barrier/d-wave superconductor (F/F/B/d-wave SC) heterojunction. Our research indicates that the spin-triplet pairing states induced by non-collinear magnetizations do not lead to the splitting of the zero-bias conductance peak (ZBCP), and the anomalous Andreev reflection makes a significant contribution to the ZBCP. In the case of half-metal, the triplet bound states appear at zero incident energy due to Klein tunneling, which is coincide with the singlet bound states, resulting in the ZBCP arises solely due to spin-triplet pairing states. The ZBCP can be modulated by the exchange field strength, Fermi level and magnetizations angle. These findings offer deeper understanding of the influence of non-collinear magnetizations on anomalous Andreev reflection in graphene-based F/F/B/d-wave SC heterojunctions and hold promise for the development of graphene-based superconducting spintronic devices.
我们研究了基于石墨烯的铁磁体/铁磁体/势垒/d波超导体（F/F/B/d波SC）异质结中的零偏置电导峰。我们的研究表明，非共线磁化诱导的自旋三重态配对态不会导致零偏置电导峰（ZBCP）的分裂，并且反常安德列夫反射对ZBCP有显著贡献。在半金属情况下，由于克莱因隧穿，三重态束缚态出现在零入射能量处，这与单重态束缚态重合，导致ZBCP仅由自旋三重态配对态产生。ZBCP可以通过交换场强度、费米能级和磁化角度进行调制。这些发现为深入理解非共线磁化对基于石墨烯的F/F/B/d波SC异质结中反常安德列夫反射的影响提供了帮助，并为基于石墨烯的超导自旋电子器件的发展带来了希望。
