量子体系中外场对体系熵的影响

The effects of external fields on the entropy of quantum systems

讨论并计算了量子情况下磁场中二维电子气体系的熵，发现存在磁场时二维电子气体系的熵有可能大于无磁场时的熵．从而证明了对于在外场下的量子体系Baierlein的观点不成立（Baierlein认为对所有的热力学体系．体系的熵总是随外场或粒子间相互作用的引入而减小）．

in this paper, the entropy of a certain quantum system, the 2D electron gas in themagnetic field has been calculated and discussed. It is found that the entropy of the 2D electron gas in the magnetic field could be larger than that of the same system without field.This result disproved the Baierlein's idea: The entropy of any thermal system will decreasewhen the external field or the interaction are applied.