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Influence of strain and quantum confinement on the optical properties of InGaAs/GaAs V-groove quantum wires (2000)

Constantin, C. ; Martinet, E. ; Lelarge, F. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 88 (2000), S. 141-147

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We report on the impact of quantum confinement and strain effects on the optical properties of state-of-the-art, densely stacked, In0.15Ga0.85As/GaAs V-groove quantum wires. High uniformity and efficient carrier capture lead to narrow (6 meV) and intense emission from the wires. Large optical polarization anisotropy is obtained thanks to the combined effects of lateral quantum confinement and triaxial strain. Band filling in the fundamental subband occurs at a modest carrier density (∼9×105 cm−1), and is accompanied by a small spectral blueshift of the emission. Several sharp excitonic resonances associated with two dimensionally confined subbands of dominant heavy-hole character are observed in photoluminescence excitation spectroscopy, together with a remarkably small Stokes shift (3 meV). The subband separations (∼24 meV) are nearly independent of the wire thickness, as the nonuniform Indium composition across the structure is found to dominate the lateral confinement for thick wires. Such strained quantum wires are promising for the realization of advanced nanostructure devices. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.373634

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Digitale Medien

Carrier transport and luminescence in inverted-pyramid quantum structures (2000)

Leifer, K. ; Hartmann, A. ; Ducommun, Y. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 77 (2000), S. 3923-3925

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Cathodoluminescence spectroscopy and wavelength-dispersive imaging were employed for investigating the carrier transport and recombination in GaAs/AlGaAs inverted-pyramid quantum dot (QD) heterostructures grown on patterned (111)B GaAs substrates. The spectra and images clearly evidence carrier recombination in quantum wells and quantum wires (QWR) and show potential variations in these structures. Luminescence from the lens-shaped QDs was identified and characterized as a function of the GaAs layer thickness. Furthermore, we show a tapering of the GaAs QWR that self-forms at the corners of the pyramids. Application of such tapered QWRs as "exciton accelerators" is discussed. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1332099

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