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Optical anisotropy of (001)-GaAs surface quantum wells
Max-Planck-Institut Festkorperforschung, Stuttgart, Germany; Instituto de Investigación en Comunicación Optica, Universidad Autonóma de San Luis Potosí, San Luis Potosí, Mexico.
Max-Planck-Institut Festkorperforschung, Stuttgart, Germany.ORCID-id: 0000-0003-2887-049X
Max-Planck-Institut Festkorperforschung, Stuttgart, Germany; Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany.
Max-Planck-Institut Festkorperforschung, Stuttgart, Germany.
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2001 (Engelska)Ingår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 64, nr 24, s. 2453031-2453038, artikel-id 245303Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report a reflectance difference spectroscopy (RDS) study of the optical anisotropy of GaAs:(001) surface quantum wells consisting of a thin GaAs layer (3-30 nm thick) embedded between an arsenic reconstructed surface and an AlAs barrier. The RDS spectra display anisotropic contributions from the free surface and from the GaAs/AlAs interface. By comparing RDS spectra for the c(4×4) and (2×4) surface reconstructions, we separate these two contributions, and demonstrate that the anisotropy around the E1 and E11 transitions comprises a component originating from modifications of bulk states near the surface. The latter is attributed to anisotropic strains induced by the surface reconstruction. The experimental data are well described by a model for the RDS response of the multilayer structures, which also takes into account the blue energy shifts and the changes in oscillator strength of the E1 and E11 transitions induced by quantum-well confinement.

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2001. Vol. 64, nr 24, s. 2453031-2453038, artikel-id 245303
Nyckelord [en]
arsenic; gallium arsenide, anisotropy; article; energy; optics; oscillator; quantum mechanics; reflectometry; surface property
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URN: urn:nbn:se:hig:diva-23221DOI: 10.1103/PhysRevB.64.245303ISI: 000173082500055Scopus ID: 2-s2.0-0035894507OAI: oai:DiVA.org:hig-23221DiVA, id: diva2:1062371
Tillgänglig från: 2017-01-05 Skapad: 2017-01-05 Senast uppdaterad: 2018-03-13Bibliografiskt granskad

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