Thermodynamic Properties of the One-Dimensional Extended Quantum Compass Model in the Presence of a Transverse Field

TL;DR

This paper investigates the thermodynamic behavior of the one-dimensional extended quantum compass model under a transverse magnetic field, revealing significant effects near quantum critical points, including large magnetocaloric effects during adiabatic processes.

Contribution

It provides a detailed analysis of thermodynamic properties and the magnetocaloric effect in the quantum compass model with a transverse field, highlighting behavior near quantum phase transitions.

Findings

Large magnetocaloric effect near quantum critical points

Temperature drops during adiabatic demagnetization near phase transitions

Significant variations in entropy and specific heat close to critical points

Abstract

The presence of a quantum critical point can significantly affect the thermodynamic properties of a material at finite temperatures. This is reflected, e.g., in the entropy landscape S(T; c) in the vicinity of a quantum critical point, yielding particularly strong variations for varying the tuning parameter c such as magnetic field. In this work we have studied the thermodynamic properties of the quantum compass model in the presence of a transverse field. The specific heat, entropy and cooling rate under an adiabatic demagnetization process have been calculated. During an adiabatic (de)magnetization process temperature drops in the vicinity of a field-induced zero-temperature quantum phase transitions. However close to field-induced quantum phase transitions we observe a large magnetocaloric effect.