Orbital Dependence of Quasiparticle Lifetimes in Sr2RuO4

TL;DR

This paper models quasiparticle lifetimes and dispersions in Sr2RuO4's low energy bands, achieving good agreement with experimental data for lifetimes across all bands and dispersions specifically in the alpha-band.

Contribution

It introduces a phenomenological Hamiltonian approach that accurately reproduces quasiparticle lifetimes and dispersions in Sr2RuO4, aligning with experimental measurements.

Findings

Computed quasiparticle lifetimes match ARPES data across all bands.

Good agreement between calculated and measured dispersions in the alpha-band.

Model reproduces mass renormalization observed in experiments.

Abstract

Using a phenomenological Hamiltonian, we investigate the quasiparticle lifetimes and dispersions in the three low energy bands, gamma, beta, and alpha of Sr2RuO4. Couplings in the Hamiltonian are fixed so as to produce the mass renormalization as measured in magneto-oscillation experiments. We thus find reasonable agreement in all bands between our computed lifetimes and those measured in ARPES experiments by Kidd et al. [1] and Ingle et al. [2]. In comparing computed to measured quasiparticle dispersions, we however find good agreement in the alpha-band alone.