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

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.

journal version; 4+5 pages

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Cited by in corpus (2)

• Optical conductivity of a metal near an Ising-nematic quantum critical point
• Quantum criticality and optical conductivity in a two-valley system