Electron-acoustic-phonon scattering and electron relaxation in two-coupled quantum rings

Abstract

Electron relaxation, induced by acoustic phonons, is studied for coupled quantum rings in the presence of external fields, both electric and magnetic. We address the problem of a single electron in vertically coupled GaAs quantum rings. Electron-phonon interaction is accounted for both deformation potential and piezoelectric field coupling mechanisms. Depending on the external fields, the ring radii and the separation between the rings, we show that the two different couplings have different weights and importance. Significant oscillations are found in the scattering rates from electron excited states to the ground state, as a function of either the geometry of the system or the external fields.

17 pages, 8 figures, to appear in Journal of Applied Physics

References in corpus (2)

• Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots
• Artificial molecular quantum rings: Spin density functional theory calculations

Cited by in corpus (5)

• Few-electron artificial molecules formed by laterally coupled quantum rings
• Control of the persistent currents in two interacting quantum rings through the Coulomb interaction and inter-ring tunneling
• Characteristic molecular properties of one-electron double quantum rings under magnetic fields
• Artificial molecular quantum rings under magnetic field influence
• Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields