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Proceedings Paper

Experimental realization of a Fabry-Perot-type interferometer by co-propagating edge states in the integer and fractional quantum Hall effect regimes
Author(s): Eduard V. Deviatov; Bastian Marquardt; Axel Lorke; Giorgio Biasiol; Lucia Sorba
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Paper Abstract

A Fabry-Perot-type interferometer is experimentally realized for electrons in a semiconductor device. Interference conditions are created for co-propagating electrons in quantum Hall edge states, which results in oscillations of the current through the device for integer and fractional filling factors. We find the interference oscillations in transport across the incompressible strips with local filling factors νc = 1, 4/3, 2/3 even at high imbalances, exceeding the spectral gaps. In contrast, there is no sign of the interference in transport across the principal Laughlin νc = 1/3 incompressible strip. This indicates, that even at fractional νc, the interference effects are caused by "normal" electrons. The oscillation's period is determined by the effective interferometer area, which is sensitive to the filling factors because of screening effects.

Paper Details

Date Published: 28 May 2009
PDF: 10 pages
Proc. SPIE 7364, Nanotechnology IV, 73640Q (28 May 2009); doi: 10.1117/12.819527
Show Author Affiliations
Eduard V. Deviatov, Institute of Solid State Physics (Russian Federation)
Bastian Marquardt, Univ. Duisburg-Essen (Germany)
Axel Lorke, Univ. Duisburg-Essen (Germany)
Giorgio Biasiol, Lab. Nazionale TASC, INFM-CNR (Italy)
Lucia Sorba, Lab. Nazionale TASC, INFM-CNR (Italy)
Scuola Normale Superiore di Pisa (Italy)

Published in SPIE Proceedings Vol. 7364:
Nanotechnology IV
Achim Wixforth, Editor(s)

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