Electronic Hong Ou Mandel interferences to unveil the 2/3 fractional quantum Hall edge channel dynamics

Abstract

Electronic Hong-Ou-Mandel (HOM) current noise interferometry has revealed anyonic statistics in Fractional Quantum Hall (FQH) states at ν = 1/3 and 2/5. However, hole-conjugate phases (½ < ν < 1), like ν = 2/3, host both charge and neutral edge modes, are disorder-sensitive, and pose challenges for interferometry. We present time-domain HOM and Photon-Assisted Shot Noise (PASN) measurements at ν = 2/3 to probe edge mode dynamics and tunneling charge. Using PASN’s fractional Josephson relation, we measure an e/3 tunneling charge and show that DC shot noise overestimates charge below ~100 mK. PASN reveals damping of downstream charge modes due to limited propagation of upstream neutral modes beyond a micrometer-scale equilibration length. Time-resolved HOM measurements confirm picosecond pulse broadening. These results suggest revisiting the neutral mode status, highlight the limitations of HOM interferometry in hole-conjugate phases and provide a path to explore complex FQH states that host neutral or non-Abelian modes.

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Item Type:	Article
Authors/Creators:	De, A. Boudet, C. https://orcid.org/0009-0000-2977-1579 Nath, J. Kapfer, M. Farrer, I. https://orcid.org/0000-0002-3033-4306 Ritchie, D.A. Roulleau, P. https://orcid.org/0000-0002-8397-5019 Glattli, D.C. https://orcid.org/0000-0002-1457-0915
Copyright, Publisher and Additional Information:	© The Author(s) 2025. This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creativecommons.org/licenses/by-nc-nd/4.0/.
Keywords:	Quantum Hall; Topological insulators
Dates:	Submitted: 11 December 2024 Accepted: 14 August 2025 Published (online): 26 September 2025 Published: 26 September 2025
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > School of Electrical and Electronic Engineering
Date Deposited:	29 Sep 2025 14:03
Last Modified:	29 Sep 2025 14:03
Status:	Published
Publisher:	Springer Science and Business Media LLC
Refereed:	Yes
Identification Number:	10.1038/s41467-025-63308-2
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:232337

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Electronic Hong Ou Mandel interferences to unveil the 2/3 fractional quantum Hall edge channel dynamics

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