University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Theoretical analysis of electron-hole alignment in InAs-GaAs quantum dots

Barker, J A and O'Reilly, E P (2000) Theoretical analysis of electron-hole alignment in InAs-GaAs quantum dots Physical Review B (PRB), 61 (20). pp. 13840-13851.

[img] Text
theoretical_analysis_BARKER_00.pdf - Version of Record

Download (305kB)


We present a theoretical analysis of the mean electron and hole positions in self-assembled InAs-GaAs quantum-dot structures. Because of the asymmetric dot shape, the electron center of mass should be displaced with respect to the hole center of mass in such dots, giving rise to a built-in dipole moment. Theoretical calculations on ideal pyramidal dots predict the electron to be localized above the hole, contrary to the results of recent Stark-effect spectroscopy. We use an efficient plane-wave envelope-function technique to determine the ground-state electronic structure of a range of dot models. In this technique, the Hamiltonian matrix elements due to all components of the potential are determined using simple analytical expressions. We demonstrate that the experimental data are consistent with a truncated dot shape and graded composition profile, with indium aggregation at the top surface of the dot.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Authors :
Barker, J A
O'Reilly, E P
Date : May 2000
DOI : 10.1103/PhysRevB.61.13840
Related URLs :
Additional Information : ©2000 The American Physical Society
Depositing User : Melanie Hughes
Date Deposited : 07 Jan 2011 11:38
Last Modified : 31 Oct 2017 14:06

Actions (login required)

View Item View Item


Downloads per month over past year

Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800