Directed transport in coupled noisy Josephson junctions controlled via ac signals
arXiv:1203.6236 · doi:10.1088/0031-8949/2012/T151/014021
Abstract
Transport properties of two coupled Josephson junctions driven by ac currents and thermal fluctuations are studied with the purpose of determining dc voltage characteristics. It is a physical realization of directed transport induced by a non-biased zero averaged external signal. The ac current is applied either to (A) only one junction as a biharmonic current or (B) is split into two simple harmonic components and separately applied to respective junctions. We identify regimes where junctions can operate with the same as well as opposite signs of voltages. A general observation is that in the same parameters regimes, the scenario (B) is more efficient in the sense that the induced dc voltages take greater values.
10 pages, 4 figures
References in corpus (14)
- Artificial Brownian motors: Controlling transport on the nanoscale
- Persistent currents in normal metal rings
- Absolute negative mobility induced by thermal equilibrium fluctuations
- Photon shell game in three-resonator circuit quantum electrodynamics
- Entropic particle transport in periodic channels
- Accelerating numerical solution of Stochastic Differential Equations with CUDA
- Observation of negative absolute resistance in a Josephson junction
- Anomalous transport in biased ac-driven Josephson junctions: Negative conductances
- Current reversals in a rocking ratchet: dynamical vs symmetry-breaking mechanisms
- Inertial Brownian motors driven by biharmonic signals
- Interaction-induced negative mobility: realization in a system of two coupled Josephson junctions
- Transport driven by biharmonic forces: impact of correlated thermal noise
- Current-flux characteristics in mesoscopic nonsuperconducting rings
- Two coupled Josephson junctions: dc voltage controlled by biharmonic current