RESONANT MODES IN JOSEPHSON STRUCTURES
It is well-known that a Josephson junction held at finite voltage V generates an alternating current at a frequency w=(2e/n)V. When the junction is coupled to an external resonator self-induced dc current modes occur in the structure. The nonlinear interaction with the ac Josephson radiation gives rise to current singularities at voltages corresponding to the resonance frequencies of the resonator. These resonances appear in the dc current voltage characteristics as current singularities. They are due to a conversion of dc power to ac power that in turn is internally dissipated. In a tunnelling junction the resonator is formed of the two superconducting electrodes separated by the oxide layer. In a two junctions interferometer the resonant structure is formed of the loop inductance and the junction capacitances. A good knowledge of the behaviour of these singularities is very important when switching properties are considered or ac power has to be extracted from the structure. In this paper we review the behaviour of resonant modes in Josephson junctions coupled to a resonant structure. Our attention is mainly focused on single junctions exhibiting interferential behaviour and on two junctions interferometers. A comparison between experimental data and the theoretical description at present available is reported.
Bibliographic Reference: WRITE TO SERVIZIO STUDI E DOLCUMENTAZIONE - ENEA, CENTRO RICERCHE ENERGIA FRASCATI, C.P. 65 - 00044 FRASCATI, ROMA (ITALY), MENTIONING REPORT RT/FUS/85/11, 1985
Record Number: 1989125046800 / Last updated on: 1987-07-01
Available languages: en