Spectroscopic access to single-hole energies in InAs/GaAs quantum dots

E. Siebert, T. Warming, A. Schliwa, E. Stock, M. Winkelnkemper, S. Rodt, and D. Bimberg
Phys. Rev. B 79, 205321 – Published 28 May 2009

Abstract

We present a purely spectroscopic way to determine single-particle energy level splittings in individual InAs/GaAs QDs. The method is based on a combination of μ-photoluminescence spectroscopy (μPL) with resonant excitation and μ-photoluminescence excitation spectroscopy (μPLE) of charged QDs. The approach allows elimination of all contributions from few-particle interactions such that true single-particle energy level distances are determined. For the present InAs/GaAs QDs, showing ground-state recombination energies between 1.23 to 1.27 eV, the splitting between the hole ground state (h0) and first excited state (h1) is Δ(h0h1)=(27.1±1.8)meV. The splitting between the first and second excited hole states is Δ(h1h2)=(10.8±0.3)meV. These values are in good agreement with results from eight-band kp calculations on lens-shaped InAs/GaAs QDs. Theoretical investigations identify unambiguously the heavy-hole-light-hole coupling as the decisive parameter leading to a nonzero h1h2 splitting.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 25 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.205321

©2009 American Physical Society

Authors & Affiliations

E. Siebert, T. Warming, A. Schliwa, E. Stock, M. Winkelnkemper, S. Rodt, and D. Bimberg

  • Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 79, Iss. 20 — 15 May 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×