Probing the spin states of three interacting electrons in quantum dots

Details Probing the spin states of three interacting electrons in quantum dots Probing the spin states of three interacting electrons in quantum dots

2011-09-22

arxiv.org/abs/1109.4758v1

Phys. Rev. B 85, 033307 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.85.033307

We observe a low-lying sharp spin mode of three interacting electrons in an array of nanofabricated AlGaAs/GaAs quantum dots by means of resonant inelastic light scattering. The finding is enabled by a suppression of the inhomogeneous contribution to the excitation spectra obtained by reducing the number of optically-probed quantum dots. Supported by configuration-interaction calculations we argue that the observed spin mode offers a direct probe of Stoner ferromagnetism in the simplest case of three interacting spin one-half fermions.

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