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    Quantum and classical resonant escapes of a strongly driven Josephson junction

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    HanSiyuan_PRB_2010(81)144518.pdf (506.0Kb)
    Issue Date
    2010-04-28
    Author
    Yu, Haifeng
    Zhu, X. B.
    Peng, Z. H.
    Cao, W. H.
    Cui, D. J.
    Tian, Ye
    Chen, G.
    Zheng, D. N.
    Jing, X. N.
    Lu, Li
    Zhao, Shiping
    Han, Siyuan
    Publisher
    American Physical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    The properties of phase escape in a dc superconducting quantum interference device (SQUID) at 25 mK, which is well below quantum-to-classical crossover temperature Tcr, in the presence of strong resonant ac driving have been investigated. The SQUID contains two Nb/Al-AlOx/Nb tunnel junctions with Josephson inductance much larger than the loop inductance so it can be viewed as a single junction having adjustable critical current. We find that with increasing microwave power W and at certain frequencies ν and ν/2, the single primary peak in the switching current distribution, which is the result of macroscopic quantum tunneling of the phase across the junction, first shifts toward lower bias current I and then a resonant peak develops. These results are explained by quantum resonant phase escape involving single and two photons with microwave-suppressed potential barrier. As W further increases, the primary peak gradually disappears and the resonant peak grows into a single one while shifting further to lower I. At certain W, a second resonant peak appears, which can locate at very low I depending on the value of ν. Analysis based on the classical equation of motion shows that such resonant peak can arise from the resonant escape of the phase particle with extremely large oscillation amplitude resulting from bifurcation of the nonlinear system. Our experimental result and theoretical analysis demonstrate that at T⪡Tcr, escape of the phase particle could be dominated by classical process, such as dynamical bifurcation of nonlinear systems under strong ac driving.
    Description
    This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevB.81.144518.
    URI
    http://hdl.handle.net/1808/17504
    DOI
    https://doi.org/10.1103/PhysRevB.81.144518
    Collections
    • Physics & Astronomy Scholarly Works [1713]
    Citation
    H. F. Yu, X. B. Zhu, Z. H. Peng, W. H. Cao, D. J. Cui, Ye Tian, G. H. Chen, D. N. Zheng, X. N. Jing, Li Lu, S. P. Zhao, and Siyuan Han. "Quantum and classical resonant escapes of a strongly driven Josephson junction." Phys. Rev. B 81, 144518 – Published 28 April 2010. http://dx.doi.org/10.1103/PhysRevB.81.144518.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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