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Phys. Rev. B 78, 134518 (2008) [9 pages]

Quantum electrodynamics and photon-assisted tunneling in long Josephson junctions

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A. O. Sboychakov1,2, Sergey Savel’ev1,3, and Franco Nori1,4
1Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan
2Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, 125412 Moscow, Russia
3Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom
4Department of Physics, Center for Theoretical Physics, Applied Physics Program, Center for the Study of Complex Systems, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

Received 14 April 2008; revised 5 August 2008; published 15 October 2008

We describe the interaction between an electromagnetic field and a long Josephson junction driven by a dc current. We calculate the amplitudes of emission and absorption of light via the creation and annihilation of quantized Josephson plasma waves (JPWs). Both the energies of JPW quanta and the amplitudes of light absorption and emission strongly depend on the junction’s length and can be tuned by an applied dc current. Moreover, photon-assisted macroscopic quantum tunneling in long Josephson junctions shows resonances when the frequency of the outside radiation coincides with the current-driven eigenfrequencies of the quantized JPWs.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.134518
DOI:
10.1103/PhysRevB.78.134518
PACS:
74.50.+r
 
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