Terahertz photoresponse of quantum wires in magnetic fields

✍ Scribed by J. Kono; Y. Nakamura; X.G. Peralta; J. Černe; S.J. Allen; Jr.; H. Akiyama; H. Sakaki; T. Sugihara; S. Sasa; M. Inoue

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 102 KB
• Volume: 20
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0093

✦ Synopsis

We have investigated the terahertz photoresponse of quantum wires in high magnetic fields, employing intense far-infrared (FIR) radiation from the UCSB Free-Electron Lasers. Both GaAs-based and InAs-based quantum wires, with widths ranging from 50 nm to 1 µm, were studied. At high FIR power we observed Shubnikov-de Haas type oscillations in photoresponse versus magnetic field, B, resulting from non-resonant electronic heating; the oscillations were much more pronounced than those in resistance versus B. At low FIR power we observed resonant peaks due to magnetoplasmon excitations, whose strength shows strong polarization-dependence and whose energy extrapolates to a finite value at zero B. These results provide a powerful tool for characterizing 1D electronic states in quantum wires.