Optical emission from the one-dimensional electron gas in narrow modulation-doped GaAs/(InGa)As/(AlGa)As quantum wires fabricated by lateral top barrier modulation |
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| Institution: | 1. Department of Mathematics and Science Education, Faculty of Education, Sivas Cumhuriyet University, 58140, Sivas, Turkey;2. Basic and Applied Scientific Research Center (BASRC), College of Science of Dammam, Imam Abdulrahman Bin Faisal University, P. O. Box 1982, 31441, Dammam, Saudi Arabia;3. Department of Physics, College of Sciences for Girls, Imam Abdulrahman Bin Faisal University, Saudi Arabia;4. Centro de Investigación en Ciencias-IICBA, Universidad Autónoma Del Estado de Morelos, Ave. Universidad 1001, CP, 62209, Cuernavaca, Morelos, Mexico;5. Department of Physics, Faculty of Science, Sivas Cumhuriyet University, 58140, Sivas, Turkey;1. Lev Academic Center, Physics/Electro-Optics Eng. Dept., Advanced Lab. of Electro-Optics (ALEO), 21 Havaad Haleumi St., POB 16031, Jerusalem 9116001, Israel;2. Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, Israel;3. Rafael Advanced Defense Systems LTD. Ctr 630, POB 2250, 3102102 Haifa, Israel;4. Nanotechnology Educational and Research Center, Lev Academic Center, Jerusalem 9116001, Israel |
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| Abstract: | We report on the fabrication and photoluminescence characterisation of n-type doped quantum wires, which are based on a modulation-doped GaAs/(InGa)As/(AlGa)As quantum well structure, as used in inverted high electron mobility transistors. Lateral patterning was performed by electron beam lithography followed by a selective wet etch process to remove the n-type doped GaAs top barrier between the wire regions. The removal of the top barrier was verified by micro-Raman spectroscopy. Spatially indirect emission from the one-dimensional (ID) electron gas formed in the quantum wires is observed in low-temperature photoluminescence, even for the narrowest geometrical wire width of 23 nm. The emission shows a blue-shift for wire widths below 100 nm, which amounts to up to 60 meV for the narrowest wires.PACS: 78.66.Fd, 73.20.Dx, 78.55.Cr |
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