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HAIT Journal of Science and Engineering A Volume 5, Issues 1-2, pp. 212-242 © 2008 Holon Institute of Technology |
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Resonance phenomena in macroscopic quantum tunneling: the small viscosity limit
Yuri N. Ovchinnikov1, Sara Rombetto2,*, Berardo Ruggiero2, |
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1L.D. Landau Institute for Theoretical Physics, RAS, Moscow, Russia 2Istituto di Cibernetica ``E. Caianiello" del CNR, Pozzuoli (Naples), Italy 3ENEA, Frascati (Roma), Italy 2Dipartimento di Ingegneria dell'Informazione, Seconda Università di Napoli, Naples, Italy *Corresponding author: s.rombetto@cib.na.cnr.it Received 5 October 2007 |
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We present a theoretical study of the resonant quantum behavior for a macroscopic superconducting system interacing with an external microwave at proper frequency. Here we consider a system described by a double well potential, a rf-SQUID, in the extremely underdamped regime. Numerical simulations for resonant phenomena have been performed for this system, whose parameters belong to the range typically used in the experiments. The dependence of the transition probability W on the external drive of the system, jx can show three resonance peaks, in a small microwave frequency range. One peak is connected with the anticrossing and the other two with the external microwave frequency n. The relative position and the height of the two lateral peaks depends on the microwave frequency. This behavior is studied here for the first time. PACS: 74.50.+r, 03.65.Yz, 03.67.Lx |
This article was published in Phys. Lett. A, DOI http://dx.doi.org/10.1016/j.physleta.2007.08.061, Yu.N. Ovchinnikov, S. Rombetto, B. Ruggiero, V. Corato, P. Silvestrini, Resonance Phenomena in Macroscopic Quantum Tunneling: the small viscosity limit, Copyright Elsevier (2007). |
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