Junctions and Superconducting Symmetry in Twisted Bilayer Graphene

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...

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Published inPhysical review letters Vol. 131; no. 1; p. 016003
Main Authors Sainz-Cruz, Héctor, Pantaleón, Pierre A, Phong, Võ Tiến, Jimeno-Pozo, Alejandro, Guinea, Francisco
Format Journal Article
LanguageEnglish
Published United States 07.07.2023
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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, the f-wave leads to a prominent peak in subgap conductance, as seen in experiments.
AbstractList 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, the f-wave leads to a prominent peak in subgap conductance, as seen in experiments.
Author Pantaleón, Pierre A
Phong, Võ Tiến
Jimeno-Pozo, Alejandro
Sainz-Cruz, Héctor
Guinea, Francisco
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  givenname: Pierre A
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  givenname: Võ Tiến
  surname: Phong
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  givenname: Francisco
  surname: Guinea
  fullname: Guinea, Francisco
  organization: Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastian, Spain
BackLink https://www.ncbi.nlm.nih.gov/pubmed/37478460$$D View this record in MEDLINE/PubMed
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CitedBy_id crossref_primary_10_1103_PhysRevResearch_5_L032033
crossref_primary_10_1103_PhysRevB_108_L180504
crossref_primary_10_1002_adfm_202401748
crossref_primary_10_1038_s41467_024_45950_4
crossref_primary_10_1103_PhysRevLett_131_146601
crossref_primary_10_1103_PhysRevB_108_094520
crossref_primary_10_1016_j_commatsci_2024_113076
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Title Junctions and Superconducting Symmetry in Twisted Bilayer Graphene
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