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

Journal Article · Mon Oct 24 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.187001· OSTI ID:1968438

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

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

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

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.

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

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

Grant/Contract Number:: SC0022106

OSTI ID:: 1968438

Journal Information:: Physical Review Letters, Vol. 129, Issue 18; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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