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Spin-resolved dynamical conductance of a correlated large-spin magnetic molecule

Anna Płomińska ; Maciej Misiorny (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Ireneusz Weymann
Physical Review B: covering condensed matter and materials physics (2469-9950). Vol. 95 (2017), 15, p. 155446.
[Artikel, refereegranskad vetenskaplig]

The finite-frequency transport properties of a large-spin molecule attached to ferromagnetic contacts are studied theoretically in the Kondo regime. The focus is on the behavior of the dynamical conductance in the linear response regime, which is determined by using the numerical renormalization group method. It is shown that the dynamical conductance depends greatly on the magnetic configuration of the device and intrinsic parameters of the molecule. In particular, conductance exhibits characteristic features for frequencies corresponding to the dipolar and quadrupolar exchange fields resulting from the presence of spin-dependent tunneling. Moreover, a dynamical spin accumulation in the molecule, associated with the off-diagonal-in-spin component of the conductance, is predicted. This spin accumulation becomes enhanced with increasing the spin polarization of the leads, and it results in a nonmonotonic dependence of the conductance on frequency, with local maxima occurring for characteristic energy scales.

Nyckelord: spin-resolved transport, Kondo effect, magnetic molecule, magnetic anisotropy, charge correlations, dynamical conductance, dynamical spin accumulation



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Denna post skapades 2017-04-26. Senast ändrad 2017-06-28.
CPL Pubid: 248964

 

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