Terahertz acoustic-phonon signal generated by heated electrons in AlGaAs/GaAs-based quantum wires |
| |
| Institution: | 1. James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK;2. School of Chemistry, University of Leicester, Leicester LE1 7RH, UK;1. CSIRO Land and Water, Private Bag No.5, Wembley, Western Australia 6913, Australia;2. School of Pathology and Laboratory Medicine, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;3. CSIRO Land and Water, Black Mountain Laboratories, P.O. Box 1700, Canberra, ACT 2601, Australia;4. Water Corporation of Western Australia, 629 Newcastle Street, Leederville, Western Australia 6007, Australia |
| |
| Abstract: | In this paper, we explore theoretically the possibility of applying AlGaAs/GaAs-based quantum wire systems as a terahertz (THz) ultrasonic generator. For structures such as AlxGa1-xAs/GaAs-based low-dimensional semiconductor systems and semiconductor nanostructures, electrons are confined within the nanometer distance scale so that energies (e.g. electronic subband energy, electron kinetic energy, Fermi energy, etc.) are in the meV scale, which consequently results in the acoustic-phonons generated by heated electrons from these novel systems to be around the THz frequency range. Our theoretical results indicate that: (i) AlxGa-xAs/GaAs-based quantum wires are suitable for generating THz acoustic-phonon signals; (ii) both longitudinal and transverse acoustic-phonon modes contribute to the detected phonon signals; (iii) the THz ultrasound wave can be generated through both intra- and inter-subband scattering processes; and (iv) the strong dependence of the acoustic-phonon emission from a quantum wire on phonon frequency and phonon emission angle can be observed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
