Intrinsic non-magnetic phi0 Josephson junctions in twisted bilayer graphene

DIPC Seminars

Speaker

Miguel Alvarado
Universidad Autonoma Madrid, Spain

When

2023/10/24
14:15

Place

In- person Seminar: Donostia International Physics Center

Host

Sebastian Bergeret

Add to calendar

iCal

Recent experiments have demonstrated the possibility to design highly controllable junctions on magic angle twisted bilayer graphene, enabling the test of its superconducting transport properties. We show that the presence of chiral pairing in such devices manifests in the appearance of an anomalous Josephson effect ( phi0 behavior) even in the case of symmetric junctions and without requiring any magnetic materials or fields. Such behavior arises from the combination of chiral pairing and nontrivial topology of the twisted bilayer graphene band structure that can effectively break inversion symmetry.