Nonequilibrium Dynamics of Anisotropic Large Spins in the Kondo Regime: Time-Dependent Numerical Renormalization Group Analysis
Strongly Correlated Electrons
2011-01-27 v2 Mesoscale and Nanoscale Physics
Abstract
We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S > 1/2, we analyze the underscreening of the local moment and the effect of anisotropy terms on the relaxation dynamics of the magnetization. Underscreening by single-channel Kondo processes leads to a logarithmically slow relaxation, while finite uniaxial anisotropy causes a saturation of the SMM's magnetization. Additional transverse anisotropy terms induce quantum spin tunneling and a pseudospin-1/2 Kondo effect sensitive to the spin parity.
Keywords
Cite
@article{arxiv.0705.3654,
title = {Nonequilibrium Dynamics of Anisotropic Large Spins in the Kondo Regime: Time-Dependent Numerical Renormalization Group Analysis},
author = {David Roosen and Maarten R. Wegewijs and Walter Hofstetter},
journal= {arXiv preprint arXiv:0705.3654},
year = {2011}
}
Comments
4 pages, 5 figures, published version