Flat Club - Benjamin Sacepe (Grenoble)

16.12.2025 12:30 – 14:00

Chiral supercurrent in quantum Hall Josephson junctions
Benjamin Sacépé, Néel Institute, CNRS Grenoble

Hybridizing superconductivity with the quantum Hall effects has major potential for designing novel circuits capable of inducing and manipulating non-Abelian states. In this talk I will present our recent results on quantum Hall Josephson junctions based on graphene nanoribbons. I will show that with suitably designed junctions, a robust supercurrent can develop on the quantum Hall plateau of normal state resistance h/2e2 and withstand up to 8 teslas [1]. The particular feature of those junctions is a chiral supercurrent with an unusual 2Φ0=h/e flux periodicity, indicating that the Andreev bound states propagate in a chiral fashion via the quantum Hall edge channels and form a loop along the sample periphery. The key parameters that limit the supercurrent in the quantum Hall regime and their consequences for more exotic quantum Hall states will also be discussed.

[1] H. Vignaud et al. Nature 624, 545 (2023)

Lieu

Bâtiment: Ecole de Physique

Auditoire Stueckelberg
Pizza: 12:30, Start discussion: 13:00

entrée libre