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APS » Journals » Phys. Rev. Lett. » Volume 88 » Issue 25
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Phys. Rev. Lett. 88, 256804 (2002) [4 pages]

Collapse of the Spin-Singlet Phase in Quantum Dots

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M. Ciorga1, A. Wensauer1,3, M. Pioro-Ladriere1,2, M. Korkusinski1, J. Kyriakidis1, A. S. Sachrajda1, and P. Hawrylak1
1Institute for Microstructural Science, Research Council of Canada, Ottawa, Canada K1A OR6
2Département de Physique and CRPEMA, Université de Sherbrooke, Sherbrooke, Canada J1K 2R1
3Institute for Theoretical Physics, University of Regensburg, Regensburg, Germany

Received 21 September 2001; published 6 June 2002

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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.256804
DOI:
10.1103/PhysRevLett.88.256804
PACS:
73.20.-r, 73.23.Hk, 73.43.-f
 
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