Few-electron eigenstates of concentric double quantum rings

Details Few-electron eigenstates of concentric double quantum rings Few-electron eigenstates of concentric double quantum rings

2005-09-22

arxiv.org/abs/cond-mat/0509575v1

Phys. Rev. B 72, 155316 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.72.155316

Few-electron eigenstates confined in coupled concentric double quantum rings are studied by the exact diagonalization technique. We show that the magnetic field suppresses the tunnel coupling between the rings localizing the single-electron states in the internal ring, and the few-electron states in the external ring. The magnetic fields inducing the ground-state angular momentum transitions are determined by the distribution of the electron charge between the rings. The charge redistribution is translated into modifications of the fractional Aharonov-Bohm period. We demonstrate that the electron distribution can be deduced from the cusp pattern of the chemical potentials governing the single-electron charging properties of the system. The evolution of the electron-electron correlations to the high field limit of a classical Wigner molecule is discussed.

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