Transient magnetic tunneling mediated by a molecular bridge

0448586 - FZÚ 2016 RIV US eng J - Journal Article
Kalvová, Anděla - Špička, Václav - Velický, B.
Transient magnetic tunneling mediated by a molecular bridge.
Journal of Superconductivity and Novel Magnetism. Roč. 28, č. 3 (2015), 1087-1091. ISSN 1557-1939. E-ISSN 1557-1947
R&D Projects: GA ČR GAP204/12/0897
Institutional support: RVO:68378271
Keywords : non-equilibrium * initial conditions * transient currents * molecular islands
Subject RIV: BE - Theoretical Physics
Impact factor: 1.100, year: 2015

We calculate the excess magnetization on a molecular bridge shunting the magnetic junction. The system is represented by two ferromagnetic electrodes bridged by a molecular size island with a discrete electronic level and a local Hubbard type correlation. The island is linked to the electrodes by tunneling junctions. The coupling strength is assumed to undergo rapid changes modulating the connectivity of the system. The sudden switching events give rise to transient magnetic currents resulting in changes of magnetization at the island. They vary with the constant galvanic bias between the electrodes. Depending on the time scale of the switching series, the transients are dominated by the initial quantum correlations, or reach the kinetic stage controlled by a simple relaxation mechanism. We employ the nonequilibrium Green’s functions. The finite-time correlated initial conditions are taken into account using the partitioningin-time method.
Permanent Link: http://hdl.handle.net/11104/0250253