Optical transitions in quantum ring complexes

Abstract

Making use of a droplet-epitaxial technique, we realize nanometer-sized quantum ring complexes, consisting of a well-defined inner ring and an outer ring. Electronic structure inherent in the unique quantum system is analyzed using a micro-photoluminescence technique. One advantage of our growth method is that it presents the possibility of varying the ring geometry. Two samples are prepared and studied: a single-wall ring and a concentric double-ring. For both samples, highly efficient photoluminescence emitted from a single quantum structure is detected. The spectra show discrete resonance lines, which reflect the quantized nature of the ring-type electronic states. In the concentric double--ring, the carrier confinement in the inner ring and that in the outer ring are identified distinctly as split lines. The observed spectra are interpreted on the basis of single electron effective mass calculations.

8 pages, 7 figures, to appear in Phys. Rev. B

References in corpus (9)

• Spectroscopy of nanoscopic semiconductor rings
• Energy spectra of quantum rings
• Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect
• Aharonov-Bohm signature for neutral excitons in type-II quantum dot ensembles
• The Aharonov-Bohm effect for an exciton
• Magnetic field effects on quantum ring excitons
• Aharonov-Bohm effect of excitons in nano-rings
• Picosecond Nonlinear Relaxation of Photoinjected Carriers in a Single GaAs/AlGaAs Quantum Dot
• Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

Cited by in corpus (25)

• Self-assembly of laterally aligned GaAs quantum dot pairs
• A unified model of droplet epitaxy for compound semiconductor nanostructures: experiments and theory
• Optical Aharonov-Bohm effect in stacked type-II quantum dots
• Optical exciton Aharonov-Bohm effect, persistent current, and magnetization in semiconductor nanorings of type I and II
• Size dependent line broadening in the emission spectra of single GaAs quantum dots: Impact of surface charges on spectral diffusion
• Tunable optical Aharonov-Bohm effect in a semiconductor quantum ring
• Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy
• Electronic structure of few-electron concentric double quantum rings
• Semiconductor quantum ring as a solid-state spin qubit
• Few-electron artificial molecules formed by laterally coupled quantum rings
• Asymmetry of localised states in a single quantum ring: polarization dependence of excitons and biexcitons
• Wave function engineering in quantum dot-ring nanostructures
• Optical response of two-dimensional few-electron concentric double quantum rings: A local-spin-density-functional theory study
• Spectral broadening in self-assembled GaAs quantum dots with narrow size distribution
• Quantum information of the Aharanov-Bohm ring with Yukawa interaction in the presence of disclination
• Electron Transfer between Weakly Coupled Concentric Quantum Rings
• Electronic states of laterally coupled quantum rings
• Vertically coupled double quantum rings at zero magnetic field
• Optical and electronic properties of colloidal CdSe Quantum Rings
• Electron-acoustic-phonon scattering and electron relaxation in two-coupled quantum rings
• Electrical control of spin relaxation time in complex quantum nanostructures
• Electron energy spectrum and oscillator strengths of quantum transitions in double quantum ring nanostructure driven by electric field
• Exact wave functions for concentric two-electron systems
• Artificial molecular quantum rings under magnetic field influence
• Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields