横向场存在下一维扩展量子罗盘模型的热力学性质
Thermodynamic Properties of the One-Dimensional Extended Quantum Compass Model in the Presence of a Transverse Field
摘要：
量子临界点的存在可以显著影响有限温度下材料的热力学性质。这反映在，例如，在量子临界点附近的熵景观S（T; c）中，对于改变诸如磁场的调谐参数c产生特别强的变化。本文研究了横场作用下量子罗盘模型的热力学性质。计算了绝热退磁过程中的比热、熵和冷却速率。在绝热（去）磁化过程中，温度在场诱导的零温度量子相变附近下降。然而，接近场诱导的量子相变，我们观察到一个大的磁热效应。
英文摘要：
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.
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