Coupling between Edge and Bulk in Strong-Field Quantum Dots

Details Coupling between Edge and Bulk in Strong-Field Quantum Dots Coupling between Edge and Bulk in Strong-Field Quantum Dots

2002-03-02

arxiv.org/abs/cond-mat/0203035v1

Phys. Rev. B (Rapid Commun.) 66, 041304(R) (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.66.041304

The maximum-density-droplet (MDD) state of quantum-dot electrons becomes unstable at 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 $\sim 14$ 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.

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