High-Efficiency Deterministic Josephson Vortex Ratchet
M. Beck, E. Goldobin, M. Neuhaus, M. Siegel, R. Kleiner, D. Koelle
DOI 10.1103/PhysRevLett.95.090603 · Physical Review Letters
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Abstract
We investigate experimentally a Josephson vortex ratchet—a fluxon in an asymmetric periodic potential driven by a deterministic force with zero time average. The highly asymmetric periodic potential is created in an underdamped annular long Josephson junction by means of a current injector providing an efficiency of the device up to 91%. We measured the ratchet effect for driving forces with different spectral content. For monochromatic high-frequency drive the rectified voltage becomes quantized. At high driving frequencies we also observe chaos, subharmonic dynamics, and voltage reversal due to the inertial mass of a fluxon.
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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb-AlOx-Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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