Optical transitions in AlGaAs/GaAs quantum wires on GaAs(6 3 1) substrates studied by photoreflectance spectroscopy |
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| Institution: | 1. Coordinación para la Innovación y Aplicación de la Ciencia y Tecnología, Universidad Autónoma de San Luis Potosí, Av. Karakorum 1470, San Luis Potosí, S.L.P. 78210, Mexico;2. Physics Department, Center for Research and Advanced Studies of the National Polytechnic Institute, Apartado Postal 14–740, Mexico, D.F. 07000, Mexico;3. Physics Department, Superior School of Physics and Mathematics of the National Polytechnic Institute, Mexico, D.F. 07738, Mexico;1. Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, United States;2. Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China;1. Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan;2. Institute of Mechanics, VAST, 18 Hoang Quoc Viet, Hanoi, Viet Nam;3. Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Viet Nam;1. Department of Physics, Yeungnam University, Gyeongsan 712-749, South Korea;2. Nano Materials Evaluation Center, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea;1. Faculté des Sciences Appliquées, Département de Génie Electrique, Université Ibn-Khaldoun de Tiaret, Zaaroura BP No.78, Tiaret 14000, Algeria;2. Laboratoire de Microphysique et de Nanophysique (LaMiN), Ecole Nationale Polytechnique d’Oran, BP 1523 EL M’Naouer, Oran 31000, Algeria;3. Faculté des Sciences de la matière, Département de Physique, Université Ibn-Khaldoun de Tiaret, Zaaroura, BP No.78, Tiaret 14000, Algeria |
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| Abstract: | We present the synthesis and characterization of a system of self-assembling GaAs quantum wires (QWRs) embedded in Alx Ga1−x As barriers grown by molecular beam epitaxy on GaAs(6 3 1)-oriented substrates. We studied the optical transitions in the QWRs as a function of temperature (T) by photoreflectance (PR) spectroscopy. The energy transitions were extracted from the PR spectra employing the third-derivative functional form, and they were compared with the transitions theoretically calculated from both, a model of QWRs with cylindrical geometry and a model of a conventional square quantum well. The results show a good agreement between experimental and theoretical data in the case of the QWR model, and from this comparison we were able to identify up to 12 different transitions in the PR spectra and to study their behavior dependent on temperature. |
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