The quantum harmonic oscillator in a dissipative bath of anyon pairs

TL;DR

This paper extends open quantum system formalism to include anyon baths, analyzing their impact on a harmonic oscillator's relaxation dynamics with novel temperature-dependent spectral properties.

Contribution

It introduces a formalism for dissipative baths composed of anyons, including a mapping to bosonic baths and a generalized Wick's theorem for spectral density calculation.

Findings

Anyon baths exhibit nontrivial temperature-dependent spectral densities.

Relaxation dynamics show distinct behavior at low, intermediate, and high temperatures.

Anyonic effects are most pronounced at intermediate temperatures.

Abstract

We generalize the formalism of open quantum systems to introduce anyon baths. In particular, we work out a dissipative anyon bath composed of independent pairs of one-dimensional Grundberg-Hansson harmonically bound anyons, which are characterized by one statistical parameter. Using a mapping of these anyons to a bosonic bath with rescaled oscillator frequencies, we show that the original bilinear system-bath coupling assumes a particular non-polynomial form. To determine the relaxation properties, we use the imaginary-time path integral formalism together with a generalization of Wick's theorem in the form of a smearing formula. The latter allows to approximately calculate the anyon bath spectral density, which acquires a nontrivial temperature dependence. The corresponding relaxation dynamics of the dissipative harmonic oscillator in an anyon bath is found. Well defined limits are revealed for both low and high temperatures. Anyonic features turn out to be most pronounced in the regime of intermediate temperatures.