Download file (4.87 MB)
Download as zip (4.71 MB)

Collection

Citation

Description:

Strong interactions between electrons in two-dimensional systems in the presence of a high magnetic field give rise to fractional quantum Hall states that host quasiparticles with a fractional charge and fractional exchange statistics. Here we demonstrate high-resolution scanning tunnelling microscopy and spectroscopy of fractional quantum Hall states in ultra-clean Bernal-stacked bilayer graphene devices. Spectroscopy measurements show sharp excitations that have been predicted to emerge when electrons fractionalize into bound states of quasiparticles. We found energy gaps for candidate non-abelian fractional states that are larger by a factor of five than those in other related systems, for example, semiconductor heterostructures, and this suggests that bilayer graphene is an ideal platform for manipulating these quasiparticles and for creating topological quantum bits. We also found previously unobserved fractional states in our very clean graphene samples.

Rights:

• In Copyright
  

  This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1038/s41567-025-02830-y.

Keyword: Fractional quantum Hall states, Scanning tunnelling microscopy, Bilayer graphene

Date published: 2025-03-20

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Physics (ISSN: 17452481) vol. 21 issue. 5 p. 716-723

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1038/s41567-025-02830-y

Related item:

Other identifier(s):

Contact agent:

Updated at: 2026-07-03 15:02:46 +0900

Published on MDR: 2026-07-03 16:29:22 +0900