Quasiparticle Scattering in a Superconductor near a Nematic Critical Point: Resonance Mode and Multiple Attractive Channels

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 Δ, it is renormalized by cont...

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Bibliographic Details
Published in:Physical review letters 2022-01, Vol.128 (1), p.017001-017001, Article 017001
Main Authors: Pimenov, Dimitri, Kamenev, Alex, Chubukov, Andrey V
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
electronic structure
high-temperature superconductors
iron-based superconductors
methods in superconductivity
nematic phase transition
Physics
quantum criticality
superconducting order parameter
superconducting phase transition
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Summary: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 Δ, it is renormalized by contributions from all pairing channels. At energies of order Δ, 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.128.017001