Pauli spin blockade in weakly coupled quantum dots

Abstract

In a two-level system, constituted by two serially coupled single level quantum dots, coupled to external leads we find that the current is suppressed in one direction of biasing caused by a fully occupied two-electron triplet state in the interacting region. The efficiency of the current suppression is governed by the ratio between the interdot tunnelling rate and the level off-set. In the opposite bias direction, the occupation of the two-electron triplet is lifted which allows a larger current to flow through the system, where the conductance is provided by transitions between one-electron states and two-electron singlet states. Is is also shown that a finite ferromagnetic interdot exchange interaction provides an extended range of the current suppression, while an anti-ferromagnetic exchange leads to a decreased range of the blockade regime.

9 pages, 2 tables, 6 figures (submitted). The model Hamiltonian has been corrected, which gives the correct triplet and singlet configurations for arbitrary exchange interactions. The correction only affects the case with a finite exchange. Accordingly, Sec. IV D has been replaced with a new discussion that is relevant for the correct model. A few new references have been added

References in corpus (10)

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• Kondo tunneling tgrough a biased quantum dot

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