Charge-localization and isospin-blockade in vertical double quantum dots

Details Charge-localization and isospin-blockade in vertical double quantum dots Charge-localization and isospin-blockade in vertical double quantum dots

2004-01-22

arxiv.org/abs/cond-mat/0401429v1

Phys. Rev. B 70, 081314 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.081314

Charge localization seems unlikely to occur in two vertically coupled symmetric quantum dots even if a small bias voltage breaks the exact isospin-symmetry of the system. However for a three-electron double quantum dot we find a strong localization of charges at certain vertically applied magnetic fields. The charge localization is directly connected to new ground state transitions between eigenstates differing only in parity. The transitions are driven by magnetic field dependent Coulomb correlations between the electrons and give rise to strong isospin blockade signatures in transport through the double dot system.

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