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TitleA.C. measurements of edgeless currents in a Corbino ring in the quantum Hall regime
Publication TypeJournal Article
Year of Publication1997
AuthorsJeanneret, B., Hall B.D., Jeckelmann B., Feller U., Bühlmann H.-J., and Ilegems M.
JournalSolid State Communications
Pagination287 - 290
Date Published1997
ISSN00381098 (ISSN)
KeywordsCorbino ring, Electric current measurement, Electric impedance, Hall effect, Radial current flow, Semiconducting aluminum compounds, Semiconducting gallium arsenide
AbstractMeasurements have been made of radial currents in a two dimensional electron gas in the quantum Hall regime using a Corbino ring geometry. A small solenoid is used to modulate the flux linking a high mobility GaAs-AlxGa1-xAs Corbino ring, thereby inducing an alternating radial current flow. Plateaus of current value are observed giving a clear indication that quantization in this geometry occurs for bulk, opposed to edge, charge transport. We find that the Corbino ring behaves as a quantised a.c. current source over a wide range of loading resistance values and several decades of frequency. The internal impedance of that current source is much larger than the Hall resistance and is dominated by the internal capacitance of the ring. © 1997 Elsevier Science Ltd. All rights reserved.

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