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arXiv · 2106.15033

Quasiparticle scattering in a superconductor near a nematic critical point: resonance mode and multiple attractive channels

Dimitri Pimenov·Alex Kamenev·Andrey V. Chubukov
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Abstract

We analyze the scattering rate for 2D fermions interacting via soft nematic fluctuations. The ground state is an s-wave superconductor, but other pairing channels are almost equally attractive. This strongly alters the scattering rate: At energies beyond the pairing gap $\Delta$, it is renormalized by contributions from all pairing channels. At energies of order $\Delta$, it is determined by the competition between scattering into a gapped continuum and dispersing nematic resonance. The outcome is a "peak-peak-dip-hump" spectrum, similar, but not identical, to the "peak-dip-hump" structure in the cuprates.

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Dimitri Pimenov, Alex Kamenev, Andrey V. Chubukov. 2021-06-28. Quasiparticle scattering in a superconductor near a nematic critical point: resonance mode and multiple attractive channels. https://doi.org/10.1103/physrevlett.128.017001

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