Zhang Qingyun, Fu Deyi, Wang Baigeng, Zhang R, Xing D Y
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Phys Rev Lett. 2008 Jul 25;101(4):047005. doi: 10.1103/PhysRevLett.101.047005.
We report a theoretical investigation of the spin-dependent Andreev reflection at the interface of a graphene-based ferromagnet/superconductor junction. It is found that the ferromagnetic exchange interaction in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection. There is a transition between the specular Andreev reflection and Andreev retroreflection at which the shot noise vanishes and the Fano factor has a universal value. The present work provides a new method of detecting the specular Andreev reflection, which can be experimentally tested within the present-day technique.
我们报告了对基于石墨烯的铁磁体/超导体结界面处自旋相关安德烈夫反射的理论研究。研究发现，铁磁体中的铁磁交换相互作用可以抑制安德烈夫逆反射，但增强镜面安德烈夫反射。在镜面安德烈夫反射和安德烈夫逆反射之间存在一个转变，此时散粒噪声消失，且法诺因子具有一个通用值。本工作提供了一种检测镜面安德烈夫反射的新方法，该方法可在当今技术范围内进行实验测试。
