Coupling between edge and bulk in strong-field quantum dots

Sung Ryul Yang, S. R Eric Yang, A. H. MacDonald

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7 Citations (Scopus)

Abstract

The maximum-density-droplet (MDD) state of quantum-dot electrons becomes unstable in strong magnetic fields to the addition of interior holes. Using exact diagonalization, we demonstrate that the first hole is located at the center of the dot when the number of electrons N is smaller than ∼14 and is located away from the center for larger dots. The separation between field strengths at which additional holes are introduced becomes small for large dots, explaining recent observations of a rapid increase in dot area when the magnetic field is increased beyond the MDD stability limit. We comment on correlations between interior hole and collective edge fluctuations, and on the implications of these correlations for edge excitation models in bulk systems.

Original languageEnglish
Article number041304
Pages (from-to)413041-413044
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number4
DOIs
Publication statusPublished - 2002 Jul 15

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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