Magnetoexcitons in nanostructures exhibiting cylindrical symmetry
Department of Theoretical Physics, University of Technology and
Life Sciences, Al. Prof. S.
Kaliskiego 7, 85789
Received: 18 July 2011
Received in final form: 8 September 2011
Published online: 26 October 2011
The problem of an exciton in the cylindrical nanostructure exposed to an external static magnetic field is investigated. The theoretical model assumes anisotropic masses which are different inside and outside the nanostructure. The confinement potential has finite value at the boundaries and magnetic field is parallel to the axis of the cylinder. The screened Coulomb interaction between an electron and a hole is assumed. The consistent mathematical procedure is developed to calculate the magnetoexciton eigenfunctions and eigenenergies. Our method applies to the systems exhibiting cylindrical symmetry where, due to confinement effects accompanied by the e-h Coulomb interaction, the separation of relative- and center-of-mass motion is not possible. Numerical calculations have been performed for the quantum disk, the cylinder and the quantum rod. The magnetic field dependent energy spectrum and corresponding wave functions, expressed in terms of known one-particle electron and hole eigenfunctions, are calculated. Additionally, we point out the different role of Coulomb interaction in every case.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011