Josephson Current through Charge Density Waves
M. I. Visscher, B. Rejaei
DOI 10.1103/PhysRevLett.79.4461 · Physical Review Letters
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Abstract
The effect of the collective charge density wave (CDW) motion on the Josephson current in a superconductor/charge densitywave/superconductor junction is studied theoretically. By deriving the kinetic equations for the coupled superconductor-CDW system, it is shown that below the critical current the CDW does not move. Biased above this value, the Josephson current oscillates as a function of the velocity of the sliding CDW and the collective mode acts as a nonlinear shunting resistor parallel to the Josephson channel. Internal mode locking of the Josephson and CDW frequencies causes oscillations in the current-voltage characteristics and plateaus in the CDW conductance.
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