We investigate theoretically the collective charge density wave (CDW) motion in two inhomogeneous mesoscopic systems. Using the Keldysh formalism, we first show that the sliding motion in a superconductor/charge density wave/superconductor (S/C/S) junction acts as a non-linear shunting resistance parallel to the Josephson channel. Internal harmonic and sub-harmonic mode-locking of the CDW and Josephson frequencies causes sharp oscillations in the current-voltage characteristics and plateaus in the CDW conductance. Secondly, we show that the sliding motion in an ensemble of small Aharonov-Bohm rings is modulated by a half-flux quantum periodicity Φ0/2 = h/2e, consistent with recent experiments.
- Aharonov-Bohm effect
- Charge density waves
- Josephson effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering