Highly nonlinear excitonic Zeeman spin splitting in composition-engineered artificial atoms

V. Jovanov, T. Eissfeller, S. Kapfinger, E. C. Clark, F. Klotz, M. Bichler, J. G. Keizer, P. M. Koenraad, M. S. Brandt, G. Abstreiter, and J. J. Finley
Phys. Rev. B 85, 165433 – Published 16 April 2012

Abstract

Nonlinear Zeeman splitting of neutral excitons is observed in composition-engineered InxGa1xAs self-assembled quantum dots, and its microscopic origin is explained. Eight-band k·p simulations, performed using realistic dot parameters extracted from cross-sectional scanning tunneling microscopy measurements, reveal that a quadratic contribution to the Zeeman energy originates from a spin-dependent mixing of heavy- and light-hole orbital states in the dot. The dilute In composition (x<0.35) and large lateral size (40–50 nm) of the quantum dots investigated are shown to strongly enhance the nonlinear contribution to the excitonic Zeeman gap, providing a blueprint to enhance such magnetic nonlinearities via growth engineering of the quantum dots.

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  • Received 12 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.165433

©2012 American Physical Society

Authors & Affiliations

V. Jovanov1,*, T. Eissfeller1, S. Kapfinger1, E. C. Clark1, F. Klotz1, M. Bichler1, J. G. Keizer2, P. M. Koenraad2, M. S. Brandt1, G. Abstreiter1, and J. J. Finley1

  • 1Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
  • 2Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • *jovanov@wsi.tum.de

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Vol. 85, Iss. 16 — 15 April 2012

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