Theorists make discovery in odd triplet pairing
Date: Saturday, December 15, 2007 @ 18:24:17 MST
In a paper which will shortly appear in Physical Review Letters,
School of Physics and Astronomy Professor Oriol Valls along with lead
author Klaus Halterman (China Lake, Naval Warfare Center) and co-author
Paul Barsic (University of Minnesota) show that triplet superconducting
pairing, odd in time, is induced in clean heterostructures consisting
of an ordinary s-wave superconductor sandwiched between ferromagnets.
The paper ("Odd triplet
pairing in clean Superconductor/Ferromagnet heterostructures") shows
that the triplet correlations are spatially very long ranged.
They are largest at times of the order of the inverse of the cutoff
frequency (usually the Debye frequency) of the s-wave superconducting
interaction. The spatial behavior of these correlations is also
This phenomenon has implications not only for ordinary
heterostructures but also for fermionic superfluidity in atomic
systems, where different mechanisms for induced exotic
superconductivity have been recently proposed (e.g. PRL 97, 020402, (2006)).
More information at http://arxiv.org/abs/0704.1820
Source: by Jenny Allan, University of Minnesota