Prominent Cooper pairing away from the Fermi level and its spectroscopic signature in twisted bilayer graphene

Fabian Schrodi; Alex Aperis; Peter M. Oppeneer

doi:10.1103/PhysRevResearch.2.012066

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Prominent Cooper pairing away from the Fermi level and its spectroscopic signature in twisted bilayer graphene

Fabian Schrodi, Alex Aperis, Peter M. Oppeneer

DOI 10.1103/PhysRevResearch.2.012066 · Physical Review Research

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Abstract

We investigate phonon-mediated Cooper pairing in flat electronic band systems by solving the full-bandwidth multiband Eliashberg equations for superconductivity in magic angle twisted bilayer graphene using a realistic tight-binding model. We find that Cooper pairing away from the Fermi level contributes decisively to superconductivity by enhancing the critical temperature and ensures a robust finite superfluid density. We show that this pairing yields particle-hole asymmetric superconducting domes in the temperature-gating phase diagram and gives rise to distinct spectroscopic signatures in the superconducting state. We predict several such features in tunneling and angle-resolved photoemission spectra for future experiments.