Intrinsic nonmagnetic ϕ0 Josephson junctions in twisted bilayer graphene

M. Alvarado; P. Burset; A. Levy Yeyati

doi:10.1103/PhysRevResearch.5.L032033

← Back to search

Intrinsic nonmagnetic ϕ0 Josephson junctions in twisted bilayer graphene

M. Alvarado, P. Burset, A. Levy Yeyati

DOI 10.1103/PhysRevResearch.5.L032033 · Physical Review Research

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

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 (ϕ0 behavior) even in the case of symmetric junctions and without requiring any magnetic materials or fields. Such behavior arises from a combination of chiral pairing and nontrivial topology of the twisted bilayer graphene band structure that can effectively break inversion symmetry. Moreover, we show that the ϕ0 effect could be experimentally enhanced and controlled by electrostatic tuning of the junction transmission properties.