有限温度下石墨烯上铁磁超导隧道结中微分电导的研究

摘要

Using the extended Blonder-Tinkham-Klapwijk formalism, we investigate the conductance spectra of graphene ferromagnet/p wave superconductor junctions at finite temperature. It is found that the conduct-ance spectra at finite temperature are affected by the p wave pairing symmetry. The ferromagnetic exchange energy in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection in graphene ferromagnet/p wave superconductor junctions. The conductance decreases at finite temperature with increasing exchange energy Eh for EhEF.%利用推广的Blonder-Tinkham-Klapwijk理论研究讨论了石墨层上铁磁体/p波超导体隧道结中准粒子输运过程，计算了结的微分电导.研究结果表明，有限温度下，α=0时电导峰对应的偏压位置在eV=Δ0处，而α=2π3时，电导峰对应的偏压位置移动到eV=0．5Δ0附近.磁交换能Eh EF时微分电导随着磁交换能的增强而升高，微分电导随温度的增大而减小.