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Chiral and topological superconductivity in isospin polarized multilayer graphene

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arxiv 2409.13829 v2 pith:24GTVGHJ submitted 2024-09-20 cond-mat.supr-con cond-mat.mes-hall

classification cond-mat.supr-concond-mat.mes-hall
keywords superconductinggraphenetopologicaltransitionbelowchiralchiralitycoulomb
verification ladder T0 review T1 audit T2 compute T3 formal
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A microscopic mechanism for chiral p-wave superconductivity from Coulomb repulsion is proposed for spin- and valley-polarized state of rhombohedral multilayer graphene. The superconducting instability arises when strong Thomas-Fermi screening of the Coulomb potential allows Friedel oscillations to take over - leading to an effective attraction on length scales below the Fermi wavelength. The superconducting critical temperature is largest at low density below a Lifshitz transition to an annular Fermi sea, where the additional pocket strongly enhances Thomas-Fermi screening. The Lifshitz transition also marks a topological phase transition from a trivial to a topological superconducting phase hosting Majorana fermions. The chirality of the superconducting order parameter is selected by the chirality of the valley-polarized Bloch electrons. Our results are in reasonable agreement with observations in a recent experiment on tetralayer graphene [Han, T., Lu, Z., Hadjri, Z. et al., Nature (2025)].

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Cited by 9 Pith papers

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