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

verfasst von: G. Ernst, N. B. Zhitenev, R. J. Haug, K. Von Klitzing
Abstract: 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 profile. The amplitude of the transmitted signals oscillates with respect to the applied magnetic field with maxima appearing close to integer and fractional bulk filling factors. While the data around filling factor 1/3 are qualitatively similar to those around filling factors 1 and 2, deviations appear around filling factor 2/3. At odd filling factors, signal propagation in partially decoupled edge channels is observed.
Organisationseinheit(en): Institut für Festkörperphysik
Externe Organisation(en): Max-Planck-Institut für Festkörperforschung
Lucent
Massachusetts Institute of Technology (MIT)
Typ: Artikel
Journal: Physica E: Low-Dimensional Systems and Nanostructures
Band: 1
Seiten: 95-100
Anzahl der Seiten: 6
ISSN: 1386-9477
Publikationsdatum: 19.01.1997
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Elektronische, optische und magnetische Materialien, Atom- und Molekularphysik sowie Optik, Physik der kondensierten Materie
Elektronische Version(en): https://doi.org/10.1016/S1386-9477(97)00021-0 (Zugang: Geschlossen)

BibTeX

@article{add728e3f8fe4e389951952d19dd9b57,
title = "Probing the edge of a 2DEG by time-resolved transport measurements",
abstract = "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 profile. The amplitude of the transmitted signals oscillates with respect to the applied magnetic field with maxima appearing close to integer and fractional bulk filling factors. While the data around filling factor 1/3 are qualitatively similar to those around filling factors 1 and 2, deviations appear around filling factor 2/3. At odd filling factors, signal propagation in partially decoupled edge channels is observed.",
keywords = "Time-resolved transport measurement, Two-dimensional electron gases",
author = "G. Ernst and Zhitenev, {N. B.} and Haug, {R. J.} and {Von Klitzing}, K.",
note = "Funding information: We would like to thank B. Farid, R. Gerhardts, S. Mikhailov and D. Pfannkuche for useful discussions, A. Yacoby for critical reading of the manuscript, and K. Eberl for providing the heterostructures. N.B.Z. was supported by Alexander von Humboldt Foundation.",
year = "1997",
month = jan,
day = "19",
doi = "10.1016/S1386-9477(97)00021-0",
language = "English",
volume = "1",
pages = "95--100",
journal = "Physica E: Low-Dimensional Systems and Nanostructures",
issn = "1386-9477",
publisher = "Elsevier",
number = "1-4",
}