正常金属/铁磁体/d波超导量子点接触系统中的隧道谱  

QUANTUM POINT CONTACT CONDUCTANCE IN THE NORMAL METAL/FERROMAGNET/d-WAVE SUPERCONDUCTOR JUNCTION

作　　者：金霞[1] 董正超[2] 梁志鹏[2] 

机构地区：[1]苏州大学物理科学与技术学院,江苏苏州215006 [2]南通大学理学院,江苏南通226000

出　　处：《低温物理学报》2012年第5期370-374,共5页Low Temperature Physical Letters

摘　　要：本文研究了正常金属/铁磁体组成的量子线与d波超导体构成的量子点接触隧道结(N/FM/SC)中的隧道谱.利用推广的Blonder-Tinkham-Klapwijk(BTK)理论模型,求解Bogoliubov-de Gennes方程,计算N/FM/SC量子点接触隧道结中的微分电导.数值计算结果表明:1)中间量子线的长度以及晶轴方向会影响隧道谱的振荡周期;2)散射势垒强度影响隧道谱的峰高,铁磁体磁交换能会使峰位产生偏移.We have studied the quantum point contact tunneling spectroscopy in the normal metal/ferromagnet/dwave superconductor （N/FM/SC） junction. By applying extended the Blonder-Tinkham-Klapwijk approach, we calculated the differential conductance of N / FM / SC quantum point contact tunnelling junction by solving the Bogoliubov-de Gennes equation. And our numerical calculation demonstrated that： 1） The length of the quantum wire and the orientation of crystal axis affect the period of oscillation of the tunneling spectroscopyl 2） The strength of scattering barrier determines the height of peaks, and the exchange energy of ferromagnet results in a shift of the peak position.

关 键 词：铁磁体 d波超导体 量子线 隧道谱 

分 类 号：O511[理学—低温物理]