Interaction-induced asymmetry in infinite-temperature dynamical correlations of hard-core anyons

TL;DR

This paper investigates how fractional statistics influence dynamical correlations in infinite-temperature hard-core anyons, revealing asymmetries and decay behaviors dependent on statistical phase and interactions.

Contribution

It provides the first detailed analysis of dynamical correlations of hard-core anyons at infinite temperature, highlighting the effects of fractional statistics on Green's functions and transport regimes.

Findings

Finite interactions induce left-right asymmetry in Green's functions for 0<θ<π.

Green's function decay rate depends on statistical angle and interaction strength.

Density correlations remain unaffected by fractional statistics, matching known transport behaviors.

Abstract

We study dynamical correlations of interacting hard-core anyons on a one-dimensional lattice at infinite temperature. This is a setting in which the many-body spectrum is independent of the statistical phase $\theta$, while dynamical correlators remain sensitive to $\theta$ through nonlocal Jordan-Wigner strings. We compute single-particle Green's functions, spectral functions, and density-density correlators, thereby separating the effects of fractional statistics on one-body coherence from those on density transport in a maximally mixed ensemble. In the noninteracting case $V=0$, high-temperature averaging leads to inversion-symmetric Green's functions for all $\theta$ despite the presence of anyonic strings. Finite nearest-neighbor interactions $V$ generate, however, a pronounced left-right asymmetry in the Green's functions for $0<\theta<\pi$, with the strongest chirality appearing at intermediate couplings $V\sim J$ where interactions and hopping compete most effectively. In this regime, the Green's function decays exponentially in time with a statistical-angle-dependent decay rate. At strong coupling, the dynamics crosses over to an atomic-limit regime in which the dependence on $\theta$ is reduced. Here the Green's function decays universally as $t^{-1}$ and the corresponding spectral function displays a three-band structure. In contrast, density-density correlations are insensitive to statistics and recover the known infinite-temperature transport regimes of the XXZ chain, including ballistic, superdiffusive and diffusive behaviours. These results identify dynamical correlation functions as direct probes of fractional statistics in high-entropy quantum systems.