Hot band sound

TL;DR

This paper demonstrates that by tuning interactions in high-temperature chaotic lattice models, one can induce a transition from overdamped diffusion to underdamped 'hot band sound' in charge density waves.

Contribution

It introduces a method to achieve underdamped charge density waves in chaotic fermion models through interaction tuning, challenging the typical overdamped diffusion expectation.

Findings

Long-lived underdamped sound waves can be realized in chaotic fermion chains.

Tuning interactions allows control over damping times of charge density waves.

Underdamped sound can occur at high temperature and strong interactions.

Abstract

Chaotic lattice models at high temperature are generically expected to exhibit diffusive transport of all local conserved charges. Such diffusive transport is usually associated with overdamped relaxation of the associated currents. Here we show that by appropriately tuning the inter-particle interactions, lattice models of chaotic fermions at infinite temperature can be made to cross over from an overdamped regime of diffusion to an underdamped regime of ``hot band sound''. We study a family of one-dimensional spinless fermion chains with long-range density-density interactions, in which the damping time of sound waves can be made arbitrarily long even as an effective interaction strength is held fixed. Our results demonstrate that underdamped sound waves of charge density can arise within a single band, with strong interactions and far from integrability, and at very high temperature.