Macroscopic quantum tunneling in "Small" josephson junctions in a magnetic field

被引：6
|
作者：
Ovchinnikov, Yu. N. [1 ]
Barone, A.
Varlamov, A. A.
机构：
[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[2] Russian Acad Sci, LD Landau Theoret Phys Inst, Chernogolovka 142432, Moscow District, Russia
[3] Univ Naples Federico II, Dipartimento Sci Fis, I-80125 Naples, Italy
[4] CNR, Coherentia INFM, I-80125 Naples, Italy
[5] CNR, Coherentia INFM, I-00133 Rome, Italy
[6] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 03期
关键词：
D O I：
10.1103/PhysRevLett.99.037004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the phenomenon of macroscopic quantum tunneling (MQT) in small Josephson junctions (JJ) with an externally applied magnetic field. The latter results in the appearance of the Fraunhofer type modulation of the current density along the barrier. The problem of MQT for a pointlike JJ is reduced to the motion of the quantum particle in the washboard potential. In the case of a finite size JJ under consideration, this problem corresponds to a MQT in a potential which itself, besides the phase, depends on space variables. The general expression for the crossover temperature T-0 between thermally activated and macroscopic quantum tunneling regimes and the escaping time tau(esc) have been calculated.
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页数：4
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