Wave function engineering in quantum dot-ring nanostructures

Abstract

Modern nanotechnology allows producing, depending on application, various quantum nanostructures with the desired properties. These properties are strongly influenced by the confinement potential which can be modified, e.g., by electrical gating. In this paper we analyze a nanostructure composed of a quantum dot surrounded by a quantum ring. We show that depending on the details of the confining potential the electron wave functions can be located in different parts of the structure. Since the properties of such a nanostructure strongly depend on the distribution of the wave functions, varying the applied gate voltage one can easily control them. In particular, we illustrate the high controllability of the nanostructure by demonstrating how its coherent, optical, and conducting properties can be drastically changed by a small modification of the confining potential.

8 pages, 10 figures, 2 tables, revtex

References in corpus (16)

• Spins in few-electron quantum dots
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Energy spectra of quantum rings
• Phonon-induced decay of the electron spin in quantum dots
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• Quantum rings for beginners: Energy spectra and persistent currents
• Electrical control of spin relaxation in a quantum dot
• Optical transitions in quantum ring complexes
• Collective Coulomb Blockade in an Array of Quantum Dots: A Mott-Hubbard Approach
• The Localization-Delocalization Transition in Quantum Dots
• Theory of Single Electron Spin Relaxation in Si/SiGe Lateral Coupled Quantum Dots
• Electron spin and charge switching in a coupled quantum dot quantum ring system
• Semiconductor quantum ring as a solid-state spin qubit
• Tunable few electron quantum dots in InAs nanowires
• Probing spin relaxation in an individual InGaAs quantum dot using a single electron optical spin memory device
• Control of spin relaxation in semiconductor double quantum dots

Cited by in corpus (8)

• Dot-ring nanostructure: Rigorous analysis of many-electron effects
• Quantum-ring spin interference device tuned by quantum point contacts
• Electrical control of spin relaxation time in complex quantum nanostructures
• Quantum Dot-Ring Nanostructure - a Comparison of Different Approaches
• Charge transport through a semiconductor quantum dot-ring nanostructure
• Effective tuning of electron charge and spin distribution in a dot-ring nanostructure at the ZnO interface
• Unidirectional Quantum Transport in Optically Driven $V$-type Quantum Dot Chains
• Tunable spin dependent transport in the dor-ring nanostructure