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Comparative Numerical Analysis of Quasi-Two-Dimensional Negative and Positive Trions in High Magnetic Fields

100%

Trojnar A., Wójs A.

Acta Physica Polonica A

2008

vol. 114

issue 5

1411-1416

Exact diagonalization calculations in the Haldane spherical geometry are carried out for the three-body Coulomb problem in a quasi-two-dimensional quantum well, in the presence of perpendicular magnetic field. Simultaneous inclusion of several Landau levels and quantum well subbands in the configuration-interaction basis allowed for quantitative description of the coupling between the in-plane dynamics (governed by interplay of cyclotron quantization and Coulomb interactions) and single-particle excitations in the normal direction. The energy spectra of negative and positive trions are compared in symmetric and asymmetric wells with realistic widths and carrier concentrations. Effects of nearby impurities are also studied.

Energy and Optical Absorption Spectra of Multiply Charged Anisotropic Quantum Boxes

81%

Trojnar A., Małachowski T., Wójs A.

Acta Physica Polonica A

2007

vol. 112

issue 2

173-176

Using a simple model of a two-dimensional rectangular quantum box we study the effects of size and anisotropy on the energy and photoluminescence spectra of neutral and charged quantum dots. The competition of symmetries and energy/length scales of the free exciton or trion and of the confining potential is analyzed. The numerical calculations consisted of the diagonalization of the few-electron-hole Hamiltonian matrices in the full configuration-interaction basis, with the simultaneous resolution of the conserved orbital and spin quantum numbers.

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2 Acta Physica Polonica A

1 2008

1 2007

2 Trojnar A.

2 Wójs A.

1 Małachowski T.

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Comparative Numerical Analysis of Quasi-Two-Dimensional Negative and Positive Trions in High Magnetic Fields

Energy and Optical Absorption Spectra of Multiply Charged Anisotropic Quantum Boxes