Open Access Nano Express

Direct Interband Light Absorption in Strongly Prolated Ellipsoidal Quantum Dots’ Ensemble

KG Dvoyan1*, DB Hayrapetyan12 and EM Kazaryan1

Author Affiliations

1 Department of Applied Physics and Engineering, Russian-Armenian State University, 123 Hovsep Emin Street, Yerevan, 0051, Armenia

2 Department of Physics, State Engineering University of Armenia, 105 Terian Street, Yerevan, 0009, Armenia

For all author emails, please log on.

Nanoscale Research Letters 2008, 4:106-112  doi:10.1007/s11671-008-9209-2

Published: 3 December 2008

Abstract

Within the framework of adiabatic approximation, the energy levels and direct interband light absorption in a strongly prolated ellipsoidal quantum dot are studied. Analytical expressions for the particle energy spectrum and absorption threshold frequencies in three regimes of quantization are obtained. Selection rules for quantum transitions are revealed. Absorption edge and absorption coefficient for three regimes of size quantization (SQ) are also considered. To facilitate the comparison of obtained results with the probable experimental data, size dispersion distribution of growing quantum dots by the small semiaxe in the regimes of strong and weak SQ by two experimentally realizing distribution functions have been taken into account. Distribution functions of Lifshits–Slezov and Gaussian have been considered.

Keywords:
Ellipsoidal quantum dot; Interband light absorption; Selection rules; Quantum dot ensemble