Magnetic‐field‐induced electron transitions in concentric double quantum rings

Abstract

Within local spin‐density functional theory, we show that changes in the intensity of a magnetic field perpendicularly applied to a few‐electron concentric double quantum ring may alter the electron distribution in the constituent rings producing an observable effect on the infrared spectrum of the system. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Linear and nonlinear optical absorption coefficients in GaAs/Ga1−xAlxAs concentric double quantum rings: Effects of hydrostatic pressure and aluminum concentration

“…When compared with single QRs, these ring complexes open a new promising route, foreseen by the use of novel ring geometries, to the measurement of quantum interference effects [23,24]. A series of recent works have addressed their electronic properties [25][26][27][28][29][30] and far-infrared response [31,32]. It has been shown for example that the energy spectrum of a system of two concentric coupled rings, with similar confinement length, corresponds roughly to the superposition of the spectra of two independent rings, although interesting anti-crossings among different states of the individual rings -with the same angular momentum -can be observed [26].…”

Ground state and infrared response of triple concentric quantum ring structures

“…29 Also, it should be observable in the FIR response of these systems. 26 Very recently, GaAs/AlGaAs multiple-from triple to quintuple-concentric quantum ring structures have been fabricated by droplet epitaxy techniques and characterized by reflection high-energy electron-diffraction and atomic force microscopy techniques. 30 Motivated by this work, we have employed the local-spin density-functional theory ͑LSDFT͒, also termed LSDA, to anticipate some properties of the ground state and the dipole response of strictly twodimensional triple concentric QRs ͑TCQRs͒.…”