28 March 2002 Quantum wires and quantum dots on corrugated (311) surfaces: potential applications in optoelectronics
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Proceedings Volume 4656, Quantum Dot Devices and Computing; (2002) https://doi.org/10.1117/12.460811
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States
Abstract
GaAs and InGaAs (311) surfaces may be spontaneously corrugated with a height and a period controlled by the film composition, strain and polarity of the substrate. Using image-processed high-resolution transmission electron microscopy we found that both GaAs - AlAs interfaces in short-period superlattices (SPSL) grown on (311)A GaAs substrates are corrugated with a height of 1 nm and a lateral periodicity of 3.2 nm. The same lateral periodicity is also revealed for SPSL grown on (311)B surfaces, but the corrugation height and the degree of order are strongly reduced in this case. A strong optical anisotropy (up to 60%) is found in photoluminescence (PL) spectra for SPSLs grown on (311)A surface and not for (311)B-grown SPSLs. We observed a strong mixing between (Gamma) and X states in the conduction band for the SPSLs grown on (311)A surface which allowed realization of bright PL at room temperature at 650 nm. (311)B and (100)GaAs-AlAs SPSLs grown side by side demonstrated only weak long-wavelength PL due to disorder- induced states. (311)A SPSLs demonstrate also a slow carrier relaxation with characteristic LO-phonon scattering times in excess of 10 ps. Corrugated SLs are particularly advantageous for polarization stabilized surface emitting lasers, bright-red AlGaAs lasers and far infrared emitters and detectors.
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Nikolai N. Ledentsov, D. Litvinov, D. Gerthsen, G. A. Ljubas, V. V. Bolotov, B. R. Semyagin, Vitaly A. Shchukin, Ilja P. Soshnikov, Victor M. Ustinov, Dieter Bimberg, "Quantum wires and quantum dots on corrugated (311) surfaces: potential applications in optoelectronics", Proc. SPIE 4656, Quantum Dot Devices and Computing, (28 March 2002); doi: 10.1117/12.460811; https://doi.org/10.1117/12.460811
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