Hung Q. Nguyen, Laetitia Pascal, Z. H. Peng, Olivier Buisson, B. Gilles, Clemens Winkelmann, Hervé Courtois
A novel method to fabricate large-area superconducting hybrid tunnel junctions with a suspended central normal metal part is presented. The samples are fabricated by combining photo-lithography and chemical etch of a superconductor - insulator - normal metal multilayer. The process involves few fabrication steps, is reliable and produces extremely high-quality tunnel junctions. Under an appropriate voltage bias, a significant electronic cooling is demonstrated.
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http://arxiv.org/abs/1111.3541
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