Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field

DOI to cite this document:: 10.5283/epub.11972

Koppens, F. H. L.

; Folk, J. A.

; Elzermann, J. M.

; Hanson, R. ; Beveren, L. H. Willems van ; Vink, I. T. ; Tranitz, Hans-Peter ; Wegscheider, Werner ; Kouwenhoven, Leo P. ; Vandersypen, L. M. K.

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Date of publication of this fulltext: 11 Jan 2010 13:40

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Abstract

We observed mixing between two-electron singlet and triplet states in a double quantum dot, caused by interactions with nuclear spins in the host semiconductor. This mixing was suppressed when we applied a small magnetic field or increased the interdot tunnel coupling and thereby the singlet-triplet splitting. Electron transport involving transitions between triplets and singlets in turn ...