Time-dependent correlations in quantum magnets at finite temperature

TL;DR

This paper combines advanced theoretical models with neutron spin-echo experiments to study how the gap mode in copper nitrate behaves over time at different temperatures, revealing insights into decoherence effects.

Contribution

It introduces a time-domain approach to analyze decoherence in quantum magnets, directly comparing experimental and theoretical data without complex data processing.

Findings

Time-dependent behavior of the gap mode in copper nitrate characterized.

Decoherence effects at various temperatures elucidated.

Time domain provides a new perspective on quantum magnet dynamics.

Abstract

In this article we investigate the time dependence of the gap mode of copper nitrate at various temperatures. We combine state-of-the-art theoretical calculations with high precision neutron resonance spin-echo measurements to understand the anomalous decoherence effects found previously in this material. It is shown that the time domain offers a complementary view on this phenomenon, which allows us to directly compare experimental data and theoretical predictions without the need of further intensive data analysis, such as (de)convolution.