Volume 116, Number 5, December 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 January 2017|
Out-of-equilibrium Kondo effect in a quantum dot: Interplay of magnetic field and spin accumulation
1 Université Grenoble Alpes, INAC-PHELIQS - F-38000 Grenoble, France
2 CEA, INAC-PHELIQS - F-38000 Grenoble, France
3 Aix Marseille Univ, Université de Toulon, CNRS, CPT - Marseille, France
Received: 21 September 2016
Accepted: 3 January 2017
We present a theoretical study of low-temperature nonequilibrium transport through an interacting quantum dot in the presence of Zeeman magnetic field and current injection into one of its leads. By using a self-consistent renormalized equation of motion approach, we show that the injection of a spin-polarized current leads to a modulation of the Zeeman splitting of the Kondo peak in the differential conductance. We find that an appropriate amount of spin accumulation in the lead can restore the Kondo peak by compensating the splitting due to magnetic field. By contrast when the injected current is spin-unpolarized, we establish that both Zeeman-split Kondo peaks are equally shifted and the splitting remains unchanged. Our results quantitatively explain the experimental findings reported in Kobayashi T. et al., Phys. Rev. Lett., 104 (2010) 036804. These features could be nicely exploited for the control and manipulation of spin in nanoelectronic and spintronic devices.
PACS: 72.15.Qm – Scattering mechanisms and Kondo effect / 72.25.Dc – Spin polarized transport in semiconductors / 73.23.-b – Electronic transport in mesoscopic systems
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.