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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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)-(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 of the (0,2) state 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. Three other transitions [(1,1)-(2,0), (1,3)-(2,2), and (1,3)-(0,4)] exhibit spin blockade while other nearby transitions and opposite bias configurations do not, consistent with simple even-odd shell filling.

Original languageEnglish (US)
Article number165308
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
StatePublished - Oct 15 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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