Effect of triple interaction on energy delocalization in the strongly disordered system of interacting two-level defects

TL;DR

This paper provides a quantitatively accurate analysis of how double and triple interactions among two-level systems influence energy delocalization in disordered glasses, challenging previous overestimations of triple interactions.

Contribution

It offers a precise quantitative treatment of TLS interactions, advancing the understanding of many-body delocalization mechanisms in disordered systems.

Findings

Triple interactions do not significantly contribute to energy delocalization as previously claimed.

The study refutes earlier overestimations of TLS triple interactions.

Results support the development of a more accurate theory of many-body delocalization.

Abstract

We accurately treat the effect of the double and triple interactions of two-level systems (TLS) in glasses onto the energy delocalization due to the long-range interaction of TLS. Although this work qualitatively reproduces the estimates of our previous work we believe that it is important because in this paper the estimates are done with quantitative accuracy. This work can serve as the important step towards the development of quantitative theory of many-body delocalization due to the long-range interaction. Our study is compared with the recent work by Bodea et al claiming that the interaction of TLS triples leads to the energy delocalization. We cannot agree with the mentioned work because as we show the interaction of TLS triples was overestimated there and therefore the result for the TLS relaxation rate obtained there is invalid.