Electronic structure of few-electron concentric double quantum rings

Details Electronic structure of few-electron concentric double quantum rings Electronic structure of few-electron concentric double quantum rings

2006-03-22

arxiv.org/abs/cond-mat/0603588v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages (preprint format), 6 figures

Scientific paper

10.1103/PhysRevB.73.235327

The ground state structure of few-electron concentric double quantum rings is investigated within the local spin density approximation. Signatures of inter-ring coupling in the addition energy spectrum are identified and discussed. We show that the electronic configurations in these structures can be greatly modulated by the inter-ring distance: At short and long distances the low-lying electron states localize in the inner and outer rings, respectively, and the energy structure is essentially that of an isolated single quantum ring. However, at intermediate distances the electron states localized in the inner and the outer ring become quasi-degenerate and a rather entangled, strongly-correlated system is formed.

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