Abstract
Based on a new statistical theory, we investigate the thermodynamic anomalies of small quantum systems, such as the negative specific heat (NSH) and negative entropy (NE) within the generalized canonical ensemble. We consider the system–bath heat exchange and “uncompensated heat” in the thermodynamical level which is independent on the details of the system–bath coupling. For ideal finite systems, we calculate two thermodynamic quantities, i.e., the experimental specific heat and the entropy. The results show that the NSH and NE exist in quantum thermodynamics, particularly at low temperatures for small systems. They agree with the results of the reduced partition function theory and reveal that the finite boundary effects of the uncompensated heat and heat exchange of small quantum systems dominate the nonequilibrium irreversible processes.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant no. 11375045 and by the State Key Programs of China under Grant no. 2012CB921604.
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Zhou, L., Tang, Hy. & Ma, Yl. Thermodynamic Anomalies of Small Quantum Systems Within a New Approach to Statistical Physics. J Low Temp Phys 177, 91–98 (2014). https://doi.org/10.1007/s10909-014-1211-8
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DOI: https://doi.org/10.1007/s10909-014-1211-8