The European Physical Journal B ( IF 1.6 ) Pub Date : 2021-07-26 , DOI: 10.1140/epjb/s10051-021-00144-5 Ji-Xuan Hou 1
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Abstract
For the Blume–Emery–Griffiths (BEG) model with a positive biquadratic coupling and without the ferromagnetic coupling, the microcanonical ensemble predicts that the entropy of this model is a multivalued and non-concave function of the energy, leading to an absolute zero temperature at its highest energy level. Via increasing the energy of a BEG system, its temperature can get close to absolute zero in local microcanonical dynamics. By building up a weak coupling between two identical BEG subsystems with their energies equal to half of the highest value of the energy of this model, one subsystem can absorb energy from another and both of them evolve to the absolute zero of temperature.
Graphic abstract
中文翻译：
通过吸收能量接近温度的绝对零点
摘要
对于具有正双二次耦合且没有铁磁耦合的 Blume-Emery-Griffiths (BEG) 模型，微正则系综预测该模型的熵是能量的多值和非凹函数，导致绝对零温度处于最高能量水平。通过增加 BEG 系统的能量，其温度可以在局部微正则动力学中接近绝对零。通过在能量等于该模型最高能量值一半的两个相同 BEG 子系统之间建立弱耦合，一个子系统可以从另一个子系统吸收能量，并且它们都演化到温度的绝对零。
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