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arXiv · 1805.01179

Unconventional topological superconductivity and phase diagram for an effective two-orbital model as applied to twisted bilayer graphene

Maciej Fidrysiak·Michał Zegrodnik·Józef Spałek
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Abstract

We consider the superconducting and Mott-insulating states for the twisted bilayer graphene, modeled as two narrow-band system of electrons with appreciable intraatomic Coulomb interactions. The interaction induces kinetic exchange which leads to real-space, either triplet- or singlet-spin pairing, in direct analogy to heavy-fermions and high-temperature superconductors. By employing the statistically-consistent Gutzwiller method, we construct explicitly the phase diagram as a function of electron concentration for the spin-triplet $d_{x^2 - y^2}+id_{xy}$ paired case, as well as determine the topological edge states. The model reproduces principal features observed experimentally in a semi-quantitative manner. The essential role of electronic correlations in driving both the Mott-insulating and superconducting transitions is emphasized. The transformation of the spin-triplet state into its spin-singlet analogue is also analyzed, as well as the appearance of the phase separated superconducting+Mott-insulating state close to the half filling.

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Maciej Fidrysiak, Michał Zegrodnik, Józef Spałek. 2018-08-28. Unconventional topological superconductivity and phase diagram for an effective two-orbital model as applied to twisted bilayer graphene. https://doi.org/10.1103/physrevb.98.085436

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