Allosteric impurity effects in long spin chains

TL;DR

This paper demonstrates that simple quantum spin chains can exhibit allosteric effects, where local impurities induce significant remote changes in observable behavior, revealing new insights into quantum many-body systems.

Contribution

It shows that allosteric effects can occur in simple quantum spin chains due to impurities, a phenomenon previously associated mainly with complex biological or macromolecular systems.

Findings

Impurities at one end of a spin chain significantly affect distant observable behavior.

Spin autocorrelation functions at thermal equilibrium show pronounced allosterism.

Remote effects are localized near the impurity, not affecting the entire chain.

Abstract

Allosterism traditionally refers to local changes in an extended object, for instance the binding of a ligand to a macromolecule, leading to a localized response at some other, possibly quite remote position. Here, we show that such fascinating effects may already occur in very simple and common quantum many-body systems, such as an anisotropic Heisenberg spin chain: Introducing an impurity at one end of a sufficiently long chain may lead to quite significant changes of the observable behavior near the other end, but not in the much larger region in between. Specifically, spin autocorrelation functions at thermal equilibrium are found to exhibit a pronounced allosterism of this type.