Probing the edge of a 2DEG by time-resolved transport measurements

✍ Scribed by G. Ernst; N.B. Zhitenev; R.J. Haug; K.von Klitzing

• Book ID: 104428994
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 103 KB
• Volume: 1
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(97)00021-0

✦ Synopsis

We have studied time-resolved transport in a two-dimensional electron gas in the integer and fractional quantum Hall regime. In samples with a smooth edge and an additional screening electrode, the propagation velocity of high-frequency signals depends on the number and width of the involved edge channels, and thus can be used to obtain an approximate electron density proÿle. The amplitude of the transmitted signals oscillates with respect to the applied magnetic ÿeld with maxima appearing close to integer and fractional bulk ÿlling factors. While the data around ÿlling factor 1 3 are qualitatively similar to those around ÿlling factors 1 and 2, deviations appear around ÿlling factor 2 3 . At odd ÿlling factors, signal propagation in partially decoupled edge channels is observed.