Localization in Artificial Disorder - Two Coupled Quantum Dots

Details Localization in Artificial Disorder - Two Coupled Quantum Dots Localization in Artificial Disorder - Two Coupled Quantum Dots

2000-01-31

arxiv.org/abs/cond-mat/0001455v1

Phys. Rev. Lett. 85, 2356-2359 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.85.2356

Using Single Electron Capacitance Spectroscopy, we study electron additions in quantum dots containing two potential minima separated by a shallow barrier. Analysis of addition spectra in magnetic field allows us to distinguish whether electrons are localized in either potential minimum or delocalized over the entire dot. We demonstrate that high magnetic field abruptly splits up a low-density droplet into two smaller fragments, each residing in a potential minimum. An unexplained cancellation of electron repulsion between electrons in these fragments gives rise to paired electron additions.

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