Edge magnetoplasma excitations in quantum wire arrays

✍ Scribed by W.H. Hsieh; Y.W. Suen; B.C. Lee; L.C. Li; C.P. Lee

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 302 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.10.110

✦ Synopsis

We report the low-temperature microwave properties of edge magneto-plasma excitations in quantum-wire arrays, fabricated from a two-dimensional electron gas in a GaAs/AlGaAs heterostructure and embedded in the slots of a 50ÀO meandering coplanar waveguide. The plot of frequency versus Landau level filling factors with strong absorption gives a series of barn-shaped curves with tops being centered in the quantum Hall effect plateaus and following a straight line through the origin. Away from the plateau center, the absorption dip becomes weaker and disappears near the plateau-plateau transition regime, qualitatively following the magneto hydrodynamic model. At frequencies above this barn-shaped part, however, we also observed unexpected resonant dips.