Exploring Quantum Hall Edge Channels in Graphene as a Path to Topological Superconductivity
| When |
Jan 27, 2025
from 11:00 to 12:00 |
|---|---|
| Where | Salle des Thèses |
| Contact Name | David Carpentier |
| Attendees |
Benjamin Sacépé |
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In this talk, I will introduce a novel type of topological insulator state derived from the physics of the quantum Hall effect. This state leverages the unique properties of the zeroth Landau level in graphene—a remarkable, strongly interacting flat band where electron-electron interactions give rise to diverse broken-symmetry phases characterized by distinct topological and lattice-scale orders. These phases can be identified through transport measurements [1] and directly visualized using scanning tunneling spectroscopy [2]. I will also demonstrate how superconductivity can be induced in quantum Hall edge channels to create robust Josephson junctions, despite the presence of the strong perpendicular magnetic field [3], thus paving the way toward the realization of topological quantum Hall Josephson junctions.
[1] L. Veyrat et al. Science 367, 781 (2020)
[2] A. Coissard et al. Nature 605, 51 (2022)
[3] H. Vignaud et al. Nature 624, 545 (2023)