1999
DOI: 10.1103/physrevb.60.15901
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Real-time monitoring of InAs/GaAs quantum dot growth using ultraviolet light scattering

Abstract: We present real-time measurements of surface structure evolution during quantum dot growth in InAs/GaAs grown by molecular-beam epitaxy. The measurements were made using an ultraviolet light-scattering technique in which the 254 nm line of a mercury lamp is used as the light source. This technique provides sensitivity to roughness on lateral lengthscales as low as 154 nm for our setup. Using this technique, we can detect the onset of quantum dot formation in this system, as indicated by reflection high-energy … Show more

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Cited by 12 publications
(6 citation statements)
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“…The light scattering experiment is described in more detail in a previous publication. 5 The light scattering signal is proportional to the power spectral density ͑PSD͒ of the surface roughness at a spatial frequency q defined by the scattering geometry and the wavelength of the incident light. In this way two different spatial frequencies corresponding to roughness on length scales of 154 nm ͑41 m Ϫ1 ) and 393 nm (16 m Ϫ1 ) were monitored a͒ Electronic mail: adamcyk,aballest,pinn,tiedje@physics.ubc.ca simultaneously throughout the growth experiments.…”
Section: Introductionmentioning
confidence: 99%
“…The light scattering experiment is described in more detail in a previous publication. 5 The light scattering signal is proportional to the power spectral density ͑PSD͒ of the surface roughness at a spatial frequency q defined by the scattering geometry and the wavelength of the incident light. In this way two different spatial frequencies corresponding to roughness on length scales of 154 nm ͑41 m Ϫ1 ) and 393 nm (16 m Ϫ1 ) were monitored a͒ Electronic mail: adamcyk,aballest,pinn,tiedje@physics.ubc.ca simultaneously throughout the growth experiments.…”
Section: Introductionmentioning
confidence: 99%
“…5 The power spectral density ͑PSD͒ of a surface is defined as the Fourier transform of the surface height-height autocorrelation function. The lightscattering experiment is described in more detail in a previous publication.…”
Section: Methodsmentioning
confidence: 99%
“…Heitz et al [5] and Ramachandran et al [47] described a so-called re-entrant 2D-to-3D morphology change in which quasi-3D clusters first appear, then disappear, only to reappear with increasing deposition prior to the formation of 3D islands, for which the clusters act as precursors. Although they used a different terminology, Pinnington et al [48] identified somewhat similar behaviour using UV light scattering, but of course they were not able to produce images, so no definitive comparison can be made. In a recent paper, Patella et al [49] claimed on volumetric grounds that QDs could not be derived from quasi-3D precursors.…”
Section: Mechanism Of the 2d-to-3d Transitionmentioning
confidence: 99%