Coulomb and Spin blockade of two few-electrons quantum dots in series in the co-tunneling regime

Details Coulomb and Spin blockade of two few-electrons quantum dots in series in the co-tunneling regime Coulomb and Spin blockade of two few-electrons quantum dots in series in the co-tunneling regime

2004-07-02

arxiv.org/abs/cond-mat/0407071v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.235306

We present Coulomb Blockade measurements of two few-electron quantum dots in series which are configured such that the electrochemical potential of one of the two dots is aligned with spin-selective leads. The charge transfer through the system requires co-tunneling through the second dot which is $not$ in resonance with the leads. The observed amplitude modulation of the resulting current is found to reflect spin blockade events occurring through either of the two dots. We also confirm that charge redistribution events occurring in the off-resonance dot are detected indirectly via changes in the electrochemical potential of the aligned dot.

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