有限温度下石墨烯上铁磁超导隧道结中微分电导的研究  

Tunneling Conductance in Graphene Ferromagnet / p Wave Superconductor Junctions at Finite Temperature

作　　者：潘慧雯 刘柳[1] 胡亚云[1] 徐金良[1] 李晓薇[1] 

机构地区：[1]淮阴师范学院物理与电子电气工程学院,江苏淮安223300

出　　处：《淮阴师范学院学报（自然科学版）》2015年第1期24-29,共6页Journal of Huaiyin Teachers College;Natural Science Edition

基　　金：江苏省高校大学生实践创新训练计划重点项目(201310323007Z)

摘　　要：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e V=Δ0处,而α=2π/3时,电导峰对应的偏压位置移动到e V=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降低,在Eh=EF时微分电导为最小,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.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 conductance 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 Eh＆lt;EF（the Fermi energy in the ferromagnet region）, but the conductance increases with increasing exchange energy Eh for Eh〉EF.

关 键 词：石墨烯 铁磁体 p-波超导体 超导隧道结 微分电导 

分 类 号：O511[理学—低温物理]