交流驱动Josephson结Bloch振荡的阻抗式阶跃  

RESISTIVE STEP FROM BLOCH OSCILLATION ON JOSEPHSON JUNCTIONS DRIVEN BY AN ALTERNATING CURRENT

作　　者：孙进鸣[1] 姚希贤[1] 

机构地区：[1]南京大学物理系

出　　处：《低温物理学报》1989年第2期85-91,共7页Low Temperature Physical Letters

摘　　要：当小面积 Josephson 结的电容变得很小,可以发生电容能大于 Josephson 耦合能 E_J 的情形,这类问题须用宏观量子隧道方法来处理.在温度很低时,Josephson 结中将发生 Bloch 振荡.在射频电流驱动下,其 I-V 曲线上将出现阻抗式阶跃,本文用多变元的微扰方法解析地处理了这一问题.When the capacitance of Josephson Junction becomes very small,it may occur that the energy stored in the capacitor is greater than the Josephson coupling energy.Facing such phenomenon,we can resort to the macroscopic quantum tunneling method.At low temperature,Bloch Oscillation occurs in Josephson Junction.Driven by an alternating current,the resistive step on I-v curve will appear.We solve this problem with a many-element purturbation method.

关 键 词：JOSEPHSON结 BLOCH振荡 阶跃 

分 类 号：O511.1[理学—低温物理]