Three-junction SQUID rocking ratchet.

@article{Sterck2005ThreejunctionSR,
  title={Three-junction SQUID rocking ratchet.},
  author={Albert Sterck and Reinhold Kleiner and Dieter Koelle},
  journal={Physical review letters},
  year={2005},
  volume={95 17},
  pages={
          177006
        }
}
We investigate three-junction SQUIDs which show voltage rectification if biased with an ac current drive with zero mean value. The Josephson phase across the SQUID experiences an effective ratchet potential, and the device acts as an efficient rocking ratchet, as demonstrated experimentally for adiabatic and nonadiabatic drive frequencies. For high-frequency drives the rectified voltage is quantized due to synchronization of the phase dynamics with the external drive. The experimental data are… 

Figures from this paper

Tunable φ Josephson junction ratchet.
TLDR
It is demonstrated experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry, based on a φ Josephson junction with a ferromagnetic barrier operating in the underdamped regime, which works against the counterforce.
Efficiency of the SQUID Ratchet Driven by External Current
We study theoretically the efficiency of an asymmetric superconducting quantum interference device (SQUID) which is constructed as a loop with three capacitively and resistively shunted Josephson
Noise-induced multi-decrease and multi-increase of net voltage in Josephson junctions.
  • Jing-hui Li
  • Physics
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2010
TLDR
It is shown that, by increasing the thermal noise strength, the net voltage can be decreased and increased several times as a function of the driving frequency.
Electrically Tunable Multiterminal SQUID-on-Tip.
TLDR
A new nanoscale superconducting quantum interference device (SQUID) whose interference pattern can be shifted electrically in situ, eliminating the magnetic field "blind spots", and demonstrating spin sensitivity of 5 to 8 μB/Hz1/2 over a continuous field range of 0 to 0.5 T with promising applications for nanoscales scanning magnetic imaging.
Josephson phase diffusion in the superconducting quantum interference device ratchet.
TLDR
It is proved that in the deterministic limit this regime is essentially non-chaotic and possesses an unexpected simplicity of attractors.
Enhancement of Resonant Activation by Constant Bias Current for Superconducting Junction
We consider a superconducting (Josephson) junction driven by the thermal noise with an ac drive current and a dc constant bias current in the overdamped case and in the underdamped case,
Nanostructured Superconductors With Asymmetric Pinning Potentials: Vortex Ratchets
  • B. Plourde
  • Physics
    IEEE Transactions on Applied Superconductivity
  • 2009
Ratchets formed from spatially asymmetric confining potentials can rectify an oscillatory driving force and generate directed motion. Such devices can probe the fundamental nature of particle
Resistive State of Superconductor-Ferromagnet-Superconductor Josephson Junctions in the Presence of Moving Domain Walls.
TLDR
It is shown that in the presence of magnetization dynamics such systems become inherently dissipative and in principle cannot sustain any amount of the superconducting current because of the voltage generated by the magnetization Dynamics.
High-frequency vortex ratchet effect in a superconducting film with a nanoengineered array of asymmetric pinning sites
Vortex ratchet effect is investigated experimentally in the frequency range between 0.5 MHz and 2 GHz. The ratchet potential is provided by an array of about a quarter of a million nanoengineered
...
...

References

SHOWING 1-10 OF 10 REFERENCES
APPL
TLDR
A prototype probability package named APPL (A Probability Programming Language) is presented that can be used to manipulate random variables and examples illustrate its use.
Europhys
  • Lett. 28, 459
  • 1994
Phys
  • Rev. Lett. 87, 077002
  • 2001
Phys
  • 39, 3113
  • 1968
Phys
  • Rev. Lett. 71, 1477
  • 1993
Phys
  • Rev. Lett. 84, 258
  • 2000
Phys
  • Rev. B 70, 024524
  • 2004
Phys
  • Rev. E 65, 041110
  • 2002
Phys
  • Rev. E 63, 031111
  • 2001
Phys
  • Rep. 361, 57
  • 2002