Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 2: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs I

TT 2.3: Vortrag

Montag, 11. März 2002, 11:00–11:15, H19

Quantum resonances in a single plaquette of Josephson junctions: excitations of Rabi oscillations — •M. V. Fistul — Max-Planck Institut für Physik komplexer Systeme, Dresden, Germany

We present a theoretical study of a quantum regime of the resistive (whirling) state of dc driven anisotropic single plaquette containing small Josephson junctions. The current-voltage characteristics of such systems display resonant steps that are due to the resonant interaction between the time dependent Josephson current and the excited electromagnetic oscillations (EOs). The voltage positions of the resonances are determined by the quantum interband transitions of EOs. We show that in the quantum regime as the system is driven on the resonance, coherent Rabi oscillations between the quantum levels of EOs occur. At variance with the classical regime the magnitude and the width of resonances are determined by the frequency of Rabi oscillations that in turn, depends in a peculiar manner on an externally applied magnetic field and the parameters of the system.