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- W2792595010 abstract "The thermal field theory is applied to fermionic superfluids by doubling the degrees of freedom of the BCS theory. We construct the two-mode states and the corresponding Bogoliubov transformation to obtain the BCS thermal vacuum. The expectation values with respect to the BCS thermal vacuum produce the statistical average of the thermodynamic quantities. The BCS thermal vacuum allows a quantum-mechanical perturbation theory with the BCS theory serving as the unperturbed state. We demonstrate the perturbation theory by evaluating the leading-order corrections to the order parameter and other physical quantities. The BCS thermal vacuum is shown to be a generalized coherent and squeezed state, and it leads to a direct evaluation of the pairing correlation as a function of temperature. The correspondence between the thermal vacuum and purification of the density matrix allows a unitary transformation, and we found the geometric phase in the parameter space associated with the transformation." @default.
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- W2792595010 date "2018-03-20" @default.
- W2792595010 modified "2023-09-27" @default.
- W2792595010 title "Thermal vacuum and its perturbation theory of BCS superfluids" @default.
- W2792595010 hasPublicationYear "2018" @default.
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