Evidence for correlated electron pairs and triplets in quantum Hall interferometers.

ABSTRACT: The pairing of electrons is ubiquitous in electronic systems featuring attractive inter-electron interactions, as exemplified in superconductors. Counterintuitively, it can also be mediated in certain circumstances by the repulsive Coulomb interaction alone. Quantum Hall (QH) Fabry-Pérot interferometers (FPIs) tailored in a two-dimensional electron gas under a perpendicular magnetic field have been argued to exhibit such an unusual electron pairing, seemingly without attractive interactions. Here, we show evidence in graphene QH FPIs, revealing not only a similar electron pairing at bulk filling factor ν_B = 2, but also an unforeseen emergence of electron tripling characterized by a fractional Aharonov-Bohm flux period of h/3e (h is the Planck constant and e the electron charge)

SUBMITTER: Yang W 

PROVIDER: S-EPMC11579463 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature