Open Access Nano Review

Coupling effects on photoluminescence of exciton states in asymmetric quantum dot molecules

Nelson R Fino12, Angela S Camacho1 and Hanz Y Ramírez13*

Author Affiliations

1 Departamento de Física, Universidad de los Andes, Bogotá D.C. 111711, Colombia

2 Departamento de Física, Universidad Antonio Nariño (UAN), Bogotá D.C. 111511, Colombia

3 Grupo de Física Teórica y Computacional, Escuela de Física, Universidad Pedagógica y Tecnológica de Colombia (UPTC), Tunja 150003, Colombia

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Nanoscale Research Letters 2014, 9:297  doi:10.1186/1556-276X-9-297

Published: 12 June 2014

Abstract

We present a theoretical study of photoluminescence from exciton states in InAs/GaAs asymmetric dot pairs, where interdot coupling is reached via magnetic field in the Faraday configuration. Electronic structure is obtained by finite element calculations, and Coulomb effects are included using a perturbative approach. According to our simulated spectra, bright excited states may become optically accessible at low temperatures in hybridization regimes where intermixing with the ground state is achieved. Our results show effective magnetic control on the energy, polarization and intensity of emitted light, and suggest these coupled nanostructures as relevant candidates for implementation of quantum optoelectronic devices.

Keywords:
Quantum dot molecules; Photoluminescence; Excitons; Diamagnetism