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Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot

A. C. Johnson·J. R. Petta·C. M. Marcus·M. P. Hanson·A. C. Gossard
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Abstract

Singlet-triplet spin blockade in a few-electron lateral double quantum dot is investigated using simultaneous transport and charge-sensing measurements. Transport from the (1,1) to the (0,2) electron occupancy states is strongly suppressed relative to the opposite bias [(0,2) to (1,1)]. At large bias, spin blockade ceases as the (0,2) triplet state enters the transport window, giving a direct measure of exchange splitting as a function of magnetic field. A simple model for current and steady-state charge distribution in spin-blockade conditions is developed and found to be in excellent agreement with experiment.

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A. C. Johnson, J. R. Petta, C. M. Marcus, M. P. Hanson, A. C. Gossard. 2004-10-26. Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot. https://doi.org/10.1103/physrevb.72.165308

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