Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene

Huang, Chunli; Wei, Nemin; Qin, Wei; MacDonald, Allan H.

doi:10.1103/physrevlett.129.187001

Title: Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene

Abstract

We present a theory of superconductivity in twisted bilayer graphene in which attraction is generated between electrons on the same honeycomb sublattice when the system is close to a sublattice polarization instability. The resulting Cooper pairs are spin-polarized valley singlets. Because the sublattice polarizability is mainly contributed by interband fluctuations, superconductivity occurs over a wide range of filling fraction. It is suppressed by (i) applying a sublattice polarizing field (generated by an aligned BN substrate) or (ii) changing moiré band filling to favor valley polarization. The enhanced intrasublattice attraction close to sublattice polarization instability is analogous to enhanced like-spin attraction in liquid ³He near the melting curve and the enhanced valley-singlet repulsion close to valley-polarization instabilities is analogous to enhanced spin-singlet repulsion in metals that are close to a ferromagnetic instability. Here, we comment on the relationship between our pseudospin paramagnon model and the rich phenomenology of superconductivity in twisted bilayer and multilayer graphene.

Authors:

^[1]; Wei, Nemin ^[1];

^[1]; MacDonald, Allan H. ^[1]

Univ. of Texas at Austin, TX (United States)

Publication Date:: Mon Oct 24 00:00:00 EDT 2022

Research Org.:: Univ. of Texas at Austin, TX (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1968438

Grant/Contract Number:: SC0022106

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 129; Journal Issue: 18; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; Graphene; Unconventional superconductors; Feynman diagrams

Citation Formats


                    Huang, Chunli, Wei, Nemin, Qin, Wei, and MacDonald, Allan H. Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene.  United States: N. p., 2022. 
Web.  doi:10.1103/physrevlett.129.187001.

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                    Huang, Chunli, Wei, Nemin, Qin, Wei, & MacDonald, Allan H. Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene.  United States.  https://doi.org/10.1103/physrevlett.129.187001

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                    Huang, Chunli, Wei, Nemin, Qin, Wei, and MacDonald, Allan H. Mon .  
"Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene".  United States.  https://doi.org/10.1103/physrevlett.129.187001.  https://www.osti.gov/servlets/purl/1968438.

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@article{osti_1968438,

  title        = {Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene},

  author       = {Huang, Chunli and Wei, Nemin and Qin, Wei and MacDonald, Allan H.},

  abstractNote = {We present a theory of superconductivity in twisted bilayer graphene in which attraction is generated between electrons on the same honeycomb sublattice when the system is close to a sublattice polarization instability. The resulting Cooper pairs are spin-polarized valley singlets. Because the sublattice polarizability is mainly contributed by interband fluctuations, superconductivity occurs over a wide range of filling fraction. It is suppressed by (i) applying a sublattice polarizing field (generated by an aligned BN substrate) or (ii) changing moiré band filling to favor valley polarization. The enhanced intrasublattice attraction close to sublattice polarization instability is analogous to enhanced like-spin attraction in liquid 3He near the melting curve and the enhanced valley-singlet repulsion close to valley-polarization instabilities is analogous to enhanced spin-singlet repulsion in metals that are close to a ferromagnetic instability. Here, we comment on the relationship between our pseudospin paramagnon model and the rich phenomenology of superconductivity in twisted bilayer and multilayer graphene.},

  doi          = {10.1103/physrevlett.129.187001},

  journal      = {Physical Review Letters},

  number       = 18,

  volume       = 129,

  place        = {United States},

  year         = {Mon Oct 24 00:00:00 EDT 2022},

  month        = {Mon Oct 24 00:00:00 EDT 2022}

}

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Title: Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene

Abstract

Citation Formats

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Theory of Phonon-Mediated Superconductivity in Twisted Bilayer Graphene
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Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene
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