Persistent template effect in InAs/GaAs quantum dot bilayers

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Clarke, E. ; Howe, P. ; Taylor, M. ; Spencer, P. ; Harbord, E. ; Murray, R. ; Kadkhodazadeh, S. ; McComb, D.W. ; Stevens, B.J. ; Hogg, R.A. (2010)
  • Publisher: American Institute of Physics
  • Subject:
    arxiv: Physics::Optics | Condensed Matter::Materials Science | Condensed Matter::Mesoscopic Systems and Quantum Hall Effect | Condensed Matter::Other

The dependence of the optical properties of InAs/GaAs quantum dot(QD) bilayers on seed layer growth temperature and second layer InAs coverage is investigated. As the seed layer growth temperature is increased, a low density of large QDs is obtained. This results in a concomitant increase in dot size in the second layer, which extends their emission wavelength, reaching a saturation value of around 1400 nm at room temperature for GaAs-capped bilayers. Capping the second dot layer with InGaAs results in a further extension of the emission wavelength, to 1515 nm at room temperature with a narrow linewidth of 22 meV. Addition of more InAs to high density bilayers does not result in a significant extension of emission wavelength as most additional material migrates to coalesced InAs islands but, in contrast to single layers, a substantial population of regular QDs remains.
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