Non-Fermi Liquids, Strange Metals and Quasi-metaparticles

TL;DR

This paper introduces quasi-metaparticles, a new concept based on metastring theory, to model non-Fermi liquids and strange metals, reproducing key experimental features and offering insights into high-temperature superconductivity.

Contribution

It proposes quasi-metaparticles as a novel theoretical framework linking metastring zero modes to non-Fermi liquid behavior and strange metal properties.

Findings

Quasi-metaparticle Green's function interpolates between quasi-particle and SYK model results.

Reproduces linear temperature dependence of resistivity in the SYK limit.

Parameter can be extracted from ARPES data, aiding experimental analysis.

Abstract

We introduce the concept of quasi-metaparticles based on the theory of metaparticles, the zero modes of the metastring. We apply the concept of quasi-metaparticles to the problem of non-Fermi liquids and the properties of strange metals. In particular, we point out that the quasi-metaparticle Green's function interpolates between the canonical quasi-particle Green's function and the result found in the context of the SYK model, which presents an exactly solvable model without quasiparticles. The linear dependence of resistivity with temperature is reproduced in the SYK limit. Also, the Cooper mechanism is possible in the quasi-metaparticle case. Finally, the new parameter that characterizes quasi-metaparticles can be extracted from ARPES data. Thus, the quasi-metaparticle could be a useful new concept in the study of strange metals and high-temperature superconductivity.