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Manipulation with Andreev states in spin active mesoscopic Josephson junction | | J. Michelsen
; V.S. Shumeiko
; G. Wendin
; | | Date: |
1 Oct 2007 | | Abstract: | We investigate the properties and manipulation with the Andreev bound states
in mesoscopic Josephson junctions with magnetic scattering. We show that the
stationary Josephson effect can be treated with the one Nambu pseudo-spinor,
similar to non-magnetic junctions, thus avoiding a double counting of the
states, and revealing one pair of Andreev bound states per conducting mode. Two
alternative choices of the Nambu pseudo-spinors give the same physical results
including the cross over to the $pi$-junction regime. The ground state spin
polarization of the Andreev levels sharply changes between the values $pm 1/2$
and 0 as function of the phase difference across the junction. At the same
time, the spin current of the Andreev states is zero. By driving the phase
difference in time one is able to induce the Rabi dynamics in the Andreev
two-level system and generate time oscillation of the Josephson current. Time
variation of the magnetic moment of the junction scatterer mixes the two Nambu
pseudo-spinors resulting in the 4-level Andreev dynamics, which, however,
splits into the two equivalent rotations in the invariant two-level subspaces.
This rotation physically corresponds to the rotation of the spin of Andreev
levels, and manifests itself in the time oscillations of the spin polarization
and the Josephson current. | | Source: | arXiv, 0710.0320 | | Services: | Forum | Review | PDF | Favorites | |
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