Experimental realization of a Fabry-Perot-type interferometer by co-propagating edge states in the integer and fractional quantum Hall effect regimes

Eduard V. Deviatov; Bastian Marquardt; Axel Lorke; Giorgio Biasiol; Lucia Sorba

doi:10.1117/12.819527

28 May 2009 Experimental realization of a Fabry-Perot-type interferometer by co-propagating edge states in the integer and fractional quantum Hall effect regimes

Eduard V. Deviatov, Bastian Marquardt, Axel Lorke, Giorgio Biasiol, Lucia Sorba

Author Affiliations +

Proceedings Volume 7364, Nanotechnology IV; 73640Q (2009) https://doi.org/10.1117/12.819527
Event: SPIE Europe Microtechnologies for the New Millennium, 2009, Dresden, Germany

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 ν_c = 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 ν_c = 1/3 incompressible strip. This indicates, that even at fractional ν_c, 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.

Citation Download Citation

Eduard V. Deviatov, Bastian Marquardt, Axel Lorke, Giorgio Biasiol, and Lucia Sorba "Experimental realization of a Fabry-Perot-type interferometer by co-propagating edge states in the integer and fractional quantum Hall effect regimes", Proc. SPIE 7364, Nanotechnology IV, 73640Q (28 May 2009); https://doi.org/10.1117/12.819527

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