Theory of Excitonic Spectra and Entanglement Engineering in Dot Molecules

Gabriel Bester, J. Shumway, and Alex Zunger
Phys. Rev. Lett. 93, 047401 – Published 22 July 2004

Abstract

We present results of correlated pseudopotential calculations of an exciton in a pair of vertically stacked InGaAs/GaAs dots. Competing effects of strain, geometry, and band mixing lead to many unexpected features missing in contemporary models. The first four excitonic states are all optically active at small interdot separation, due to the broken symmetry of the single-particle states. We quantify the degree of entanglement of the exciton wave functions and show its sensitivity to interdot separation. We suggest ways to spectroscopically identify and maximize the entanglement of exciton states.

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  • Received 27 August 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.047401

©2004 American Physical Society

Authors & Affiliations

Gabriel Bester1, J. Shumway1,2, and Alex Zunger1

  • 1National Renewable Energy Laboratory, Golden, Colorado 80401, USA
  • 2Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287-1504, USA

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Issue

Vol. 93, Iss. 4 — 23 July 2004

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