Collapse of spin-singlet phase in electronic droplets

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  • 11 October 2001
Abstract
We present experimental and theoretical results that reveal and explain a novel observation in the phase diagram of quantum dots. Experimentally, the observation of the effect is made possible only by combining spin-polarized injection and detection with the control of the number N of occupied electrons. We demonstrate that the systematic oscillation of the amplitude of Coulomb blockade (CB) peaks in the vicinity of the spin-singlet droplet at filling-factor nu=2 reverses phase as a function of N. This new effect is explained in terms of the collapse of spin-singlet droplet at nu=2 in favor of spin-polarized phases above a critical number of electrons.

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