Junctions and superconducting symmetry in twisted bilayer graphene

Abstract

Junctions provide a wealth of information on the symmetry of the order parameter of superconductors. We analyze junctions between a scanning tunneling microscope (STM) tip and superconducting twisted bilayer graphene (TBG) and TBG Josephson junctions (JJs). We compare superconducting phases that are even or odd under valley exchange (s- or f-wave). The critical current in mixed (s- and f-) JJs strongly depends on the angle between the junction and the lattice. In STM-TBG junctions, due to Andreev reflection, f-wave leads to a prominent peak in subgap conductance, as seen in experiments.

5 pages, 4 figures and supplementary material. Extended discussion and minor adjustments

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Cited by in corpus (9)

• Gate-Defined Topological Josephson Junctions in Bernal Bilayer Graphene
• Vestigial singlet pairing in a fluctuating magnetic triplet superconductor: Applications to graphene moiré systems
• Approximate symmetries, insulators, and superconductivity in continuum-model description of twisted WSe${}_2$
• Probing the order parameter symmetry of two-dimensional superconductors by twisted Josephson interferometry
• Intrinsic non-magnetic ${\varphi }_0$ Josephson junctions in twisted bilayer graphene
• High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow
• Probing superconductivity with tunneling spectroscopy in rhombohedral graphene
• Mirror-protected Majorana zero modes in $f$-wave multilayer graphene superconductors
• Spectroscopic signature of spin triplet odd-valley superconductivity in two-dimensional materials