Open Access Nano Express

Trion X+ in vertically coupled type II quantum dots in threading magnetic field

Sindi Horta-Piñeres12, Gene Elizabeth Escorcia-Salas1, Ilia D Mikhailov3 and José Sierra-Ortega1*

Author Affiliations

1 Group of Investigation in Condensed Matter Theory, Universidad del Magdalena, Santa Marta, AA 731, Colombia

2 Universidad de Sucre, Sincelejo, AA 406, Colombia

3 Universidad Industrial de Santander, Bucaramanga, AA 678, Colombia

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Nanoscale Research Letters 2012, 7:532  doi:10.1186/1556-276X-7-532

Published: 26 September 2012

Abstract

We analyze the energy spectrum of a positively charged exciton confined in a semiconductor heterostructure formed by two vertically coupled, axially symmetrical type II quantum dots located close to each other. The electron in the structure is mainly located inside the dots, while the holes generally move in the exterior region close to the symmetry axis. The solutions of the Schrödinger equation are obtained by a variational separation of variables in the adiabatic limit. Numerical results are shown for bonding and anti-bonding lowest-lying of the trion states corresponding to the different quantum dots morphologies, dimensions, separation between them, thicknesses of the wetting layers, and the magnetic field strength.

Keywords:
Quantum dots; Adiabatic approximation; Trion; 78.67.-n; 71.35.Pq; 73.21.La