正常金属/绝缘层/正常金属/f波超导体量子点接触的微分电导（英文）  

QUANTUM POINT CONTACT CONDUCTANCE IN NORMAL-METAL/INSULATOR/METAL/f-WAVE SUPERCONDUCTOR JUNCTIONS

作　　者：吉跃仁[1] 

机构地区：[1]江苏财经职业技术学院,江苏淮安223003

出　　处：《低温物理学报》2014年第4期263-269,共7页Low Temperature Physical Letters

摘　　要：在Blonder–Tinkham–Klapwijk理论的框架下,计算了正常金属/绝缘层/正常金属(N/I/N)/f波超导体量子点接触的隧道谱.结果表明:在单模情况下,当f22 x-y波超导体的a轴与正常金属/f22 x-y波超导体间的界面夹角α为零度时,零偏压电导随绝缘层到界面的距离(L)变化,这导致了隧道谱中零偏压电导峰的出现或消失;当α=π/4,零偏压附近的电导随绝缘层势垒的增加,从零偏压电导峰逐渐变成了V型结构,能隙内的谱线出现尖谷,并随L的变化发生谷裂.N/I/N/f波超导体量子点接触隧道谱的这些特征与N/I/N/d波和N/I/N/p波超导体量子点接触隧道谱的特征不同,利用这些特征,我们能把f波超导体与d波和p波超导体区别开.In the framework of the Blonder-Tinkham-Klapwijk theory, the quantum point contact tunneling spectroscopy in a normal metal/insulator/metal （N/I/N） /f-wave superconductor （SC） junction is calculated. The results show in the single mode case that the zero-bias conductance va}ies with the distance （L） from insulating layer to the interface of N/fx2-y2 -wave SC when the angle a between the a-axis of thefx2-y2 -wave SC and the interface normal is zero, which cause appearance of the zero-bias conductance peak （ZBCP） or disappearance in the tunneling conductance; as a = π/4, the conductance near zero-bias change with increasing of the insulator potential from the ZBCP to the V-shape structure by degrees; the spectra inside of the gap emerge tip valley, and the valley take place splitting with varies of L. Those features of the tunneling conductance for quantum point contact in N/I/N/f-wave SC junction are very different from that in N/I/N/d-wave and N/I/N/p-wave SC junction. Using that, we can distinguish a f-wave superconductor from d-and p-wave ones.

关 键 词：量子点接触 f波超导体 隧道谱 

分 类 号：O511.3[一般工业技术—材料科学与工程]