Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-28
Physics
Condensed Matter
Superconductivity
11 pages, 5 figures
Scientific paper
The supercurrent of a quantum point contact coupled to a nanomagnet strongly depends on the dynamics of the nanomagnet's spin. We employ a fully microscopic model to calculate the transport properties of a junction coupled to a spin whose dynamics is modeled as Larmor precession brought about by an external magnetic field and find that the dynamics affects the charge and spin currents by inducing transitions between the continuum states below the superconducting gap edge and the Andreev levels. This redistribution of the quasiparticles leads to a non-equilibrium population of the Andreev levels and an enhancement of the supercurrent which is visible as a modified current-phase relation as well as a non-monotonous critical current as function of temperature. The non-monotonous behavior is accompanied by a corresponding change in spin-transfer torques acting on the precessing spin and leads to the possibility of using temperature as a means to tune the back-action on the spin.
Belzig Wolfgang
Fogelstrom Mikael
Holmqvist Cecilia
No associations
LandOfFree
Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin-precession-assisted supercurrent in a superconducting quantum point contact coupled to a single-molecule magnet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-609958