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Title: Macroscopic quantum tunneling in small Josephson junctions in a magnetic field.

Abstract

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 To between thermally activated and macroscopic quantum tunneling regimes and the escaping time {tau}{sub esc} have been calculated.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); MIUR; Russian Foundation Basic Research
OSTI Identifier:
919350
Report Number(s):
ANL/MSD/JA-60417
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0806355
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 99; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CURRENT DENSITY; JOSEPHSON JUNCTIONS; MAGNETIC FIELDS; MODULATION; TUNNELING

Citation Formats

Ovchinnikov, Yu. N., Barone, A., Varlamov, A. A., Materials Science Division, Max-Planck Inst. for Physics of Complex Systems, Landau Inst. Theoretical Physics, Univ. di Napoli Federico II, and Coherentia-INFM, CNR. Macroscopic quantum tunneling in small Josephson junctions in a magnetic field.. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.037004.
Ovchinnikov, Yu. N., Barone, A., Varlamov, A. A., Materials Science Division, Max-Planck Inst. for Physics of Complex Systems, Landau Inst. Theoretical Physics, Univ. di Napoli Federico II, & Coherentia-INFM, CNR. Macroscopic quantum tunneling in small Josephson junctions in a magnetic field.. United States. doi:10.1103/PhysRevLett.99.037004.
Ovchinnikov, Yu. N., Barone, A., Varlamov, A. A., Materials Science Division, Max-Planck Inst. for Physics of Complex Systems, Landau Inst. Theoretical Physics, Univ. di Napoli Federico II, and Coherentia-INFM, CNR. Mon . "Macroscopic quantum tunneling in small Josephson junctions in a magnetic field.". United States. doi:10.1103/PhysRevLett.99.037004.
@article{osti_919350,
title = {Macroscopic quantum tunneling in small Josephson junctions in a magnetic field.},
author = {Ovchinnikov, Yu. N. and Barone, A. and Varlamov, A. A. and Materials Science Division and Max-Planck Inst. for Physics of Complex Systems and Landau Inst. Theoretical Physics and Univ. di Napoli Federico II and Coherentia-INFM, CNR},
abstractNote = {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 To between thermally activated and macroscopic quantum tunneling regimes and the escaping time {tau}{sub esc} have been calculated.},
doi = {10.1103/PhysRevLett.99.037004},
journal = {Phys. Rev. Lett.},
number = 2007,
volume = 99,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}