Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-10-27
Europhys. Lett. 81, 67001 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final version to appear in Euro. Phys. Lett
Scientific paper
10.1209/0295-5075/81/67001
We demonstrate possible scenarios for production of pure spin current and large tunnelling magnetoresistance ratios from elastic co-tunnelling and crossed Andreev reflection across a superconducting junction comprising of normal metal-superconductor-normal metal, where, the normal metal is a one-dimensional interacting quantum wire. We show that there are fixed points in the theory which correspond to the case of pure spin current. We analyze the influence of electron-electron interaction and see how it stabilizes or de-stabilizes the production of pure spin current. These fixed points can be of direct experimental relevance for spintronics application of normal metal-superconductor-normal metal junctions of one-dimensional quantum wires. We also calculate the power law temperature dependence of the crossed Andreev reflection enhanced tunnelling magnetoresistance ratio for the normal metal-superconductor-normal metal junction.
Das Sourin
Rao Sumathi
Saha Arijit
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