Cooper-Pair Decoherence in SNS Hybrid Structure

Sammanfattning: The Laws of quantum mechanics control the behavior of electrons in nanoscale devices and nanostructures. Quantum coherence of electrons can appear in different experiments. In this work we used SNS (Superconductor-Normal-Superconductor) structures in order to experimentally and theoretically study and investigate the effect of quantum decoherence.We applied Nanofabrication technology to fabricate devices with SNS structure (using Ti-Au-Pd-Au-Pd-Al material in the shape of a sandwich structure). Fabrication has been carried out for devices with different junction lengths and thickness in the Nanofab laboratory (Clean-room) at the department of Microtechnology and Nanoscience, Chalmers University of Technology. Room and low temperature measurements were performed for respective devices and Critical currents measured as function of temperature up to 2.5uA for the shortest length (L=42nm). The result of the measurements were in agreement with what could be expected when using this fabrication system.We recommended fabrication of samples with longer junction and carrying out measurements at lower temperature down to 10mK.