Complete characterization of GaAs gradient-elastic tensors and reconstruction of internal strain in GaAs/AlGaAs quantum dots using nuclear magnetic resonance

I. M. Griffiths, H. Huang, A. Rastelli, M. S. Skolnick, and E. A. Chekhovich
Phys. Rev. B 99, 125304 – Published 20 March 2019
PDFHTMLExport Citation

Abstract

Recently, we have calibrated the diagonal components S11=Sxxxx of the GaAs gradient elastic tensor Sijkl using nuclear magnetic resonance (NMR) and photoluminescence spectroscopy of GaAs/AlGaAs quantum dot structures in Faraday geometry [E. A. Chekhovich et al., Phys. Rev. B 97, 235311 (2018)]. Here we measure quantum dot NMR spectra in oblique magnetic fields giving access to the off-diagonal components Syzyz. We find the ratios Syzyz/Sxxxx+1.980.27+0.21 for As75 and 0.400.31+0.23 for Ga69. Combined with our previous results, we find all independent nonzero components of Sijkl: QSxxxx+0.758×106 V, QSyzyz+1.51×106 V for As75 and QSxxxx0.377×106 V, QSyzyz+0.151×106 V for Ga69, where Q is the corresponding nuclear quadrupolar moment. Our results show that earlier nuclear acoustic resonance experiments [R. K. Sundfors, Phys. Rev. B 10, 4244 (1974)] most likely overestimated the GaAs gradient elastic tensors, especially for Ga69. We further use NMR spectroscopy in oblique fields for assumption-free measurement of the intrinsic strain in GaAs/AlGaAs quantum dots. We find deviations of the strain principle directions from the sample growth axis, which vary between individual quantum dots.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 4 February 2019

DOI:https://doi.org/10.1103/PhysRevB.99.125304

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

I. M. Griffiths1, H. Huang2, A. Rastelli2, M. S. Skolnick1, and E. A. Chekhovich1,*

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
  • 2Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria

  • *e.chekhovich@sheffield.ac.uk

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 99, Iss. 12 — 15 March 2019

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
×