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19 April 2024

» pubmed » pmid17501146

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Experimental signature of phonon-mediated spin relaxation in a two-electron quantum dot
T Meunier ; I T Vink ; L H Willems van Beveren ; K-J Tielrooij ; R Hanson ; F H L Koppens ; H P Tranitz ; W Wegscheider ; L P Kouwenhoven ; L M K Vandersypen ;
Date:	23 Mar 2007
Journal:	Phys Rev Lett, 98 (12), 126601
Abstract:	We observe an experimental signature of the role of phonons in spin relaxation between triplet and singlet states in a two-electron quantum dot. Using both the external magnetic field and the electrostatic confinement potential, we change the singlet-triplet energy splitting from 1.3 meV to zero and observe that the spin relaxation time depends nonmonotonously on the energy splitting. A simple theoretical model is derived to capture the underlying physical mechanism. The present experiment confirms that spin-flip energy is dissipated in the phonon bath.
Source:	PubMed, pmid17501146
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