Collapse of the spin-singlet phase in quantum dots

We present experimental and theoretical results on a new regime in quantum dots in which the filling factor two-singlet state is replaced by new spin polarized phases. We make use of spin blockade spectroscopy to identify the transition to this new regime as a function of the number of electrons. Th...

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Bibliographic Details
Published in:Physical review letters 2002-06, Vol.88 (25 Pt 1), p.256804-256804, Article 256804
Main Authors: Ciorga, M, Wensauer, A, Pioro-Ladriere, M, Korkusinski, M, Kyriakidis, J, Sachrajda, A S, Hawrylak, P
Format: Article
Language:English
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Summary:We present experimental and theoretical results on a new regime in quantum dots in which the filling factor two-singlet state is replaced by new spin polarized phases. We make use of spin blockade spectroscopy to identify the transition to this new regime as a function of the number of electrons. The key experimental observation is a reversal of the phase in the systematic oscillation of the amplitude of Coulomb blockade peaks as the number of electrons is increased above a critical number. It is found theoretically that correlations are crucial to the existence of the new phases.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.88.256804