TL;DR
This paper calculates the entropy and free energy of thin plasma sheets and slabs, revealing positive entropy for charged fluids and negative entropy in certain conditions for polarizable sheets, highlighting complex thermodynamic behaviors.
Contribution
It provides new calculations of entropy and free energy for plasma sheets and slabs, including the effects of dispersion and surface plasmons.
Findings
Entropy is positive for charged fluid plasma sheets.
Negative entropy occurs for polarizable dipole sheets in certain parameters.
Surface plasmon contributions affect the entropy of slabs.
Abstract
We calculate the entropy and the temperature dependent part of the free energy for a free standing plane plasma sheet and for the a free standing plane slab of finite thickness with dispersion described by the plasma model. In case the plasma sheet describes a charged fluid, the entropy is positive. In case it describes a polarizable dipole sheet, the entropy takes negative values in a certain parameter region. Negative entropy is also observed for the slab, however with the reservation that the contribution from the surface plasmons was not accounted for.
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