Spin-asymmetric Josephson effect

We propose that with ultracold Fermi gases one can realize a spin-asymmetric Josephson effect in which the two spin components of a Cooper pair are driven asymmetrically--corresponding to driving a Josephson junction of two superconductors with different voltages V(↑) and V(↓) for spin up and down e...

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Bibliographic Details
Published in:Physical review letters 2010-11, Vol.105 (22), p.225301-225301, Article 225301
Main Authors: Heikkinen, M O J, Massel, F, Kajala, J, Leskinen, M J, Paraoanu, G S, Törmä, P
Format: Article
Language:English
Subjects:
AMPLITUDES
ANGULAR MOMENTUM
ASYMMETRY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOPER PAIRS
ELECTRIC POTENTIAL
ELECTRONS
ELEMENTARY PARTICLES
FERMI GAS
FERMIONS
INTERFERENCE
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
LEPTONS
OSCILLATIONS
PARTICLE PROPERTIES
PARTICLES
SPIN
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TUNNEL EFFECT
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Summary:We propose that with ultracold Fermi gases one can realize a spin-asymmetric Josephson effect in which the two spin components of a Cooper pair are driven asymmetrically--corresponding to driving a Josephson junction of two superconductors with different voltages V(↑) and V(↓) for spin up and down electrons, respectively. We predict that the spin up and down components oscillate at the same frequency but with different amplitudes. Furthermore our results reveal that the standard interpretation of the Josephson supercurrent in terms of coherent bosonic pair tunneling is insufficient. We provide an intuitive interpretation of the Josephson supercurrent as interference in Rabi oscillations of pairs and single particles, the latter causing the asymmetry.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.105.225301