Open Access Nano Express

Electron States and Light Absorption in Strongly Oblate and Strongly Prolate Ellipsoidal Quantum Dots in Presence of Electrical and Magnetic Fields

Karen G Dvoyan*, David B Hayrapetyan, Eduard M Kazaryan and Ani A Tshantshapanyan

Author affiliations

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

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Citation and License

Nanoscale Research Letters 2007, 2:601-608  doi:10.1007/s11671-007-9079-z

Published: 13 November 2007

Abstract

In framework of the adiabatic approximation the energy states of electron as well as direct light absorption are investigated in strongly oblate and strongly prolate ellipsoidal quantum dots (QDs) at presence of electric and magnetic fields. Analytical expressions for particle energy spectrum are obtained. The dependence of energy levels’ configuration on QD geometrical parameters and field intensities is analytically obtained. The energy levels of electrons are shown to be equidistant both for strongly oblate and prolate QDs. The effect of the external fields on direct light absorption of a QD was investigated. The dependence of the absorption edge on geometrical parameters of QDs and intensities of the electric and magnetic fields is obtained. Selection rules are obtained at presence as well as absence of external electric and magnetic fields. In particular, it is shown that the presence of the electric field cancels the quantum numbers selection rules at the field direction, whereas in radial direction the selection rules are preserved. Perspectives of practical applications for device manufacturing based on ellipsoidal quantum dots are outlined.

Keywords:
Ellipsoidal quantum dot; Electric and magnetic field