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Open Access item Tunable Kondo effect in a double quantum dot coupled to ferromagnetic contacts

Authors:Zitko, Rok
Lim, Jong-Soo
López, Rosa
Martinek, Jan
Simon, Pascal
Issue Date:20-Apr-2012
Publisher:American Physical Society
Citation:Physical Review Letters 108(16): 166605 (2012)
Abstract:We investigate the effects induced by ferromagnetic contacts attached to a serial double quantum dot. Spin polarization generates effective magnetic fields and suppresses the Kondo effect in each dot. The superexchange interaction J AFM, tuned by the interdot tunneling rate t, can be used to compensate the effective fields and restore the Kondo resonance when the contact polarizations are aligned. As a consequence, the direction of the spin conductance can be controlled and even reversed using electrostatic gates alone. Our results demonstrate a new approach for controlling spin-dependent transport in carbon nanotube double dot devices. © 2012 American Physical Society.
URI:http://hdl.handle.net/10261/57253
Identifiers:doi: 10.1103/PhysRevLett.108.166605
issn: 0031-9007
Appears in Collections:(IFISC) Artículos

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