We investigate theoretically the transport of non–interacting electrons through an Aharanov–Bohm (AB) interferometer with two quantum dots (QD) embedded into its arms. In the Coulomb–blockade regime, transport through each QD proceeds via a single resonance. The resonances are coupled through the arms of the AB device but may also be coupled directly. In the framework of the Landauer–Büttiker a...

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We study many-body corrections to the cotunneling current via a localized state with energy epsilon(d) at large bias voltages V. We show that the transfer of electron pairs, enabled by the Coulomb repulsion in the localized level, results in ionization resonance peaks in the third derivative of the current with respect to V, centered at eV=+/-2epsilon(d)/3. Our results predict the existence of ...

Parsa Bonderson,1 Chetan Nayak,1,2 and Kirill Shtengel3,4 1Microsoft Research, Station Q, Elings Hall, University of California, Santa Barbara, California 93106, USA 2Department of Physics, University of California, Santa Barbara, California 93106, USA 3Department of Physics and Astronomy, University of California at Riverside, Riverside, California 92507, USA 4Institute for Quantum Information...

A magnet with precessing magnetization pumps a spin current into adjacent leads. As special case of this pumping, macrospin (magnetization) can assist electrons in tunneling. In small systems, however, the Coulomb blockade effect block transport electrons. Here, we investigate competition between macrospin-assisted tunneling and for simplest system where both effects meet; namely, single tunnel...