Interaction-Induced Strong Localization in Quantum Dots

Details Interaction-Induced Strong Localization in Quantum Dots Interaction-Induced Strong Localization in Quantum Dots

2007-08-09

arxiv.org/abs/0708.1304v2

Phys. Rev. B 77, 041301(R) (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, published version, revised discussion

Scientific paper

10.1103/PhysRevB.77.041301

We argue that Coulomb blockade phenomena are a useful probe of the cross-over to strong correlation in quantum dots. Through calculations at low density using variational and diffusion quantum Monte Carlo (up to r_s ~ 55), we find that the addition energy shows a clear progression from features associated with shell structure to those caused by commensurability of a Wigner crystal. This cross-over (which occurs near r_s ~ 20 for spin-polarized electrons) is, then, a signature of interaction-driven localization. As the addition energy is directly measurable in Coulomb blockade conductance experiments, this provides a direct probe of localization in the low density electron gas.

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