1999/08/31 by A. Lorke, R. J. Luyken, R.J. Luyken +6 · 19 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.84.2223
arxiv created 1999/12/01 · openalex publication_date 2000/03/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Making use of self-assembly techniques, we realize nanoscopic semiconductor quantum rings in which the electronic states are in the true quantum limit. We employ two complementary spectroscopic techniques to investigate both the ground states and the excitations of these rings. Applying a magnetic field perpendicular to the plane of the rings, we find that, when approximately one flux quantum threads the interior of each ring, a change in the ground state from angular momentum \ensuremathℓ\phantom\rule0ex0ex=\phantom\rule0ex0ex0 to \ensuremathℓ\phantom\rule0ex0ex=\phantom\rule0ex0ex\ensuremath-1 takes place. This ground state transition is revealed both by a drastic modification of the excitation spectrum and by a change in the magnetic-field dispersion of the single-electron charging energy.