Junctions and Superconducting Symmetry in Twisted Bilayer Graphene

Sainz-Cruz, Héctor; Pantaleón, Pierre A.; Phong, Võ Tiến; Jimeno-Pozo, Alejandro; Guinea, Francisco

doi:10.1103/physrevlett.131.016003

Junctions and Superconducting Symmetry in Twisted Bilayer Graphene

Journal Article · Fri Jul 07 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.131.016003· OSTI ID:2419288

^[1]; ^[2]; Phong, Võ Tiến ^[3]; ^[2]; ^[4]

Imdea Nanoscience (Spain); OSTI
Imdea Nanoscience (Spain)
Univ. of Pennsylvania, Philadelphia, PA (United States)
Imdea Nanoscience (Spain); Donostia International Physics Center (Spain)

Junctions provide a wealth of information on the symmetry of the order parameter of superconductors. Here, 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 ƒ-wave). The critical current in mixed (s and ƒ) JJs strongly depends on the angle between the junction and the lattice. In STM-TBG junctions, due to Andreev reflection, the ƒ-wave leads to a prominent peak in subgap conductance, as seen in experiments.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-84ER45118

OSTI ID:: 2419288

Alternate ID(s):: OSTI ID: 2404457

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 131; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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