Strongly coupled edge states in a graphene quantum Hall interferometer

Thomas Werkmeister, James R. Ehrets, Yuval Ronen, Marie E. Wesson, Danial Najafabadi, Zezhu Wei, Kenji Watanabe, Takashi Taniguchi, D. E. Feldman, Bertrand I. Halperin, Amir Yacoby and Philip Kim ()
Additional contact information
Thomas Werkmeister: Harvard University
James R. Ehrets: Harvard University
Yuval Ronen: Harvard University
Marie E. Wesson: Harvard University
Danial Najafabadi: Harvard University
Zezhu Wei: Brown University
Kenji Watanabe: National Institute for Materials Science, 1-1 Namiki
Takashi Taniguchi: National Institute for Materials Science, 1-1 Namiki
D. E. Feldman: Brown University
Bertrand I. Halperin: Harvard University
Amir Yacoby: Harvard University
Philip Kim: Harvard University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Electronic interferometers using the chiral, one-dimensional (1D) edge channels of the quantum Hall effect (QHE) can demonstrate a wealth of fundamental phenomena. The recent observation of phase jumps in a Fabry-Pérot (FP) interferometer revealed anyonic quasiparticle exchange statistics in the fractional QHE. When multiple integer edge channels are involved, FP interferometers have exhibited anomalous Aharonov-Bohm (AB) interference frequency doubling, suggesting putative pairing of electrons into $${{\boldsymbol{2}}}{{\boldsymbol{e}}}$$ 2 e quasiparticles. Here, we use a highly tunable graphene-based QHE FP interferometer to observe the connection between interference phase jumps and AB frequency doubling, unveiling how strong repulsive interaction between edge channels leads to the apparent pairing phenomena. By tuning electron density in-situ from filling factor $${{\boldsymbol{\nu }}} \, \, {{\boldsymbol{7}}}$$ ν > 7 , we tune the interaction strength and observe periodic interference phase jumps leading to AB frequency doubling. Our observations demonstrate that the combination of repulsive interaction between the spin-split $${{\boldsymbol{\nu }}}={{\boldsymbol{2}}}$$ ν = 2 edge channels and charge quantization is sufficient to explain the frequency doubling, through a near-perfect charge screening between the localized and extended edge channels. Our results show that interferometers are sensitive probes of microscopic interactions and enable future experiments studying correlated electrons in 1D channels using density-tunable graphene.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/s41467-024-50695-1 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50695-1

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-50695-1

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().