Interaction-Induced Spin Polarization in Quantum Dots

Abstract

The electronic states of lateral many electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb blockade peaks are measured. A zig-zag pattern is found as it is known from the Fock-Darwin spectrum. However, only data from Landau level 0 show the typical spin-induced bimodality, whereas features from Landau level 1 cannot be explained with the Fock-Darwin picture. Instead, by including the interaction effects within spin-density-functional theory a good agreement between experiment and theory is obtained. The absence of bimodality on Landau level 1 is found to be due to strong spin polarization.

4 pages, 5 figures

References in corpus (7)

• Testing of two-dimensional local approximations in the current-spin and spin-density-functional theories
• Becke-Johnson-type exchange potential for two-dimensional systems
• Spin-droplets in confined quantum Hall systems
• Half-Integer Filling Factor States in Quantum Dots
• Spin Blockade in Capacitively Coupled Quantum Dots
• Multiple transitions of the spin configuration in quantum dots
• Pfaffian and fragmented states at nu=5/2 in quantum Hall droplets

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