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Photon‐assisted tunneling in ac driven double quantum dot spin pumps
Author(s) -
Sánchez R.,
Platero G.,
Aguado R.,
Cota E.
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200566113
Subject(s) - quantum tunnelling , quantum dot , photon , condensed matter physics , coulomb blockade , spin (aerodynamics) , physics , polarization (electrochemistry) , absorption (acoustics) , voltage , optoelectronics , chemistry , quantum mechanics , optics , transistor , thermodynamics
In this work, we study the effect of an applied ac gate voltage on the spin filtering and pumping properties of a lateral double quantum dot, in the Coulomb blockade and weak coupling regimes, considering not only the effect of the ac potential on the inter‐dot tunneling but also on the tunneling through the leads. This last effect accounts for additional photon absorption and emission processes and therefore affects the spin polarization of the pumped current. In particular, we find that the spin down filtering property can be affected depending on the intensity of the ac field. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)