Pressure dependence of two-level systems in disordered atomic chain

TL;DR

This study numerically investigates how pressure influences two-level systems in disordered atomic chains, revealing a correlation between energy separation and pressure variation, with effects depending on atomic interactions.

Contribution

It demonstrates the pressure dependence of two-level systems in disordered chains and uncovers the correlation between energy separation and pressure effects, highlighting the role of atomic interactions.

Findings

Correlation between energy separation and pressure variation.

Pressure can increase or decrease asymmetry of two-level systems.

Values of energy separation depend on pressure sign.

Abstract

The dependence of two-level systems in disordered atomic chain on pressure, both positive and negative was studied numerically. The disorder was produced through the use of interatomic pair potentials having more than one energy minimum. It was found that there exists a correlation between the energy separation of the minima of two-level systems Delta and the variation of this separation with pressure. The correlation may have either positive or negative sign, implying that the asymmetry of two-level systems may in average increase or decrease with pressure depending on the interplay of different interactions between atoms in disordered state. The values of Delta depend on the sign of pressure.