Pauli spin blockade in weakly coupled quantum dots

Details Pauli spin blockade in weakly coupled quantum dots Pauli spin blockade in weakly coupled quantum dots

2005-09-19

arxiv.org/abs/cond-mat/0509482v2

Phys. Rev. B 73, 205333 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 2 tables, 6 figures (submitted). The model Hamiltonian has been corrected, which gives the correct triplet and single

Scientific paper

10.1103/PhysRevB.73.205333

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.

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