Volume 80, Number 1, October 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 September 2007|
Diode effects in the surface superconductivity regime
INPAC-Institute for Nanoscale Physics and Chemistry, K.U. Leuven - Celestijnenlaan 200D, B-3001 Leuven, Belgium
2 Departamento de Fisica, Universidade Federal de Pernambuco - Cidade Universitaria, 50670-901 Recife-PE, Brazil
Accepted: 13 August 2007
In this letter we demonstrate that large periodic arrays of asymmetric antidots perforated in a superconducting Al film rectify very efficiently an ac drive into a collective unidirectional synchronous motion of millions of vortices. Moreover, the rectification process has two distinctly different regimes: delocalized high-temperature regime with collective inter-antidot guided vortex motion and localized low-temperature regime with the intra-antidot rectification controlled by the fluxoid quantization condition satisfied synchronously at the edge of each antidot. As a result, a single condensed-matter device can be used to produce a tunable reversible macroscopic quantum diode effect important for the realization of the guided motion of large vortex ensembles for fluxonics applications.
PACS: 74.78.Na – Mesoscopic and nanoscale systems / 85.25.-j – Superconducting devices / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© Europhysics Letters Association, 2007
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