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Paper detail

Singlet-triplet transition in a few-electron lateral InGaAs-InAlAs quantum dot

The magnetic-field evolution of Coulomb blockade peaks in lateral InGaAs/InAlAs quantum dots in the few-electron regime is reported. Quantum dots are defined by gates evaporated onto a 60 nm-thick hydrogen silsesquioxane insulating film. A gyromagnetic factor of 4.4 is measured via zero-bias spin spectroscopy and a transition from singlet to triplet spin configuration is found at an in-plane magnetic field B = 0.7 T. This observation opens the way to the manipulation of singlet and triplet states at moderate fields and its relevance for quantum information applications will be discussed.

preprint2010arXivOpen access
F. DeonV. PellegriniF. CarilloF. GiazottoL. SorbaG. BiasiolF. Beltram
cond-mat.mes-hall
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F. DeonV. PellegriniF. CarilloF. GiazottoL. SorbaG. BiasiolF. Beltram

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