The Localization-Delocalization Transition in Quantum Dots

Details The Localization-Delocalization Transition in Quantum Dots The Localization-Delocalization Transition in Quantum Dots

1999-12-09

arxiv.org/abs/cond-mat/9912144v1

Science vol.285 p.715 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1126/science.285.5428.715

Single-electron capacitance spectroscopy precisely measures the energies required to add individual electrons to a quantum dot. The spatial extent of electronic wavefunctions is probed by investigating the dependence of these energies on changes in the dot confining potential. For low electron densities, electrons occupy distinct spatial sites localized within the dot. At higher densities, the electrons become delocalized, and all wavefunctions are spread over the full dot area. Near the delocalization transition, the last remaining localized states exist at the perimeter of the dot. Unexpectedly, these electrons appear to bind with electrons in the dot center.

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