Strongly coupled edge states in a graphene quantum Hall interferometer

Werkmeister, Thomas; Ehrets, James R.; Ronen, Yuval; Wesson, Marie E.; Najafabadi, Danial; Wei, Zezhu; Watanabe, Kenji; Taniguchi, Takashi; Feldman, D. E.; Halperin, Bertrand I.; Yacoby, Amir; Kim, Philip

doi:10.1038/s41467-024-50695-1

Strongly coupled edge states in a graphene quantum Hall interferometer

Journal Article · Fri Aug 02 00:00:00 EDT 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-50695-1· OSTI ID:2471897

Werkmeister, Thomas ^[1]; Ehrets, James R. ^[2]; ^[3]; Wesson, Marie E. ^[2]; Najafabadi, Danial ^[2]; ^[4]; ^[5]; ^[5]; Feldman, D. E. ^[4]; ^[2]; ^[2]; ^[2]

Harvard University, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States)
Harvard University, Cambridge, MA (United States)
Harvard University, Cambridge, MA (United States); Weizmann Institute of Science, Rehovot (Israel)
Brown University, Providence, RI (United States)
National Institute for Materials Science, Tsukuba (Japan)

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 2e 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 v < 2 to v > 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 v = 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.

View Accepted Manuscript (DOE)

Research Organization:: Harvard University, Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); MEXT, Japan; National Science Foundation (NSF)

Grant/Contract Number:: SC0012260

OSTI ID:: 2471897

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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