Melting of Interference in the Fractional Quantum Hall Effect: Appearance of Neutral Modes

We attempted to measure interference of the outer edge mode in the fractional quantum hall regime with an electronic Mach-zehnder interferometer. The visibility of the interferometer wore off as we approached ν_{B}=1 and the transmission of the quantum point contacts (QPCs) of the interferometer sim...

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Bibliographic Details
Published inPhysical review letters Vol. 122; no. 24; p. 246801
Main Authors Bhattacharyya, Rajarshi, Banerjee, Mitali, Heiblum, Moty, Mahalu, Diana, Umansky, Vladimir
Format Journal Article
LanguageEnglish
Published United States 21.06.2019
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Summary:We attempted to measure interference of the outer edge mode in the fractional quantum hall regime with an electronic Mach-zehnder interferometer. The visibility of the interferometer wore off as we approached ν_{B}=1 and the transmission of the quantum point contacts (QPCs) of the interferometer simultaneously developed a v=1/3 conductance plateau accompanied by shot noise. The appearance of shot noise on this plateau indicates the appearance of nontopological neutral modes resulting from edge reconstruction. We have confirmed the presence of upstream neutral modes measuring upstream noise emanating from the QPC. The lack of interference throughout the lowest Landau level was correlated with a proliferation of neutral modes.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.122.246801