Symplectic Representation of the Ginzburg-Landau Theory

TL;DR

This paper reformulates the Ginzburg-Landau theory of superconductivity within a symplectic geometric framework, introducing a phase space representation and analyzing non-classical features of the superconductor state.

Contribution

It presents a novel symplectic representation of the Ginzburg-Landau theory using quasi-probability distributions, linking geometric methods with superconductivity modeling.

Findings

Re-derivation of key superconductor behavior results

Determination of critical superconducting current density

Analysis of non-classicality via negativity of quasi-distribution

Abstract

In this work, the Ginzburg-Landau theory is represented on a symplectic manifold with a phase space content. The order parameter is defined by a quasi-probability amplitude, which gives rise to a quasi-probability distribution function, i.e., a Wigner-type function. The starting point is the thermal group representation of Euclidean symmetries and gauge symmetry. Well-known basic results on the behavior of a superconductor are re-derived, providing the consistency of representation. The critical superconducting current density is determined and its usual behavior is inferred. The negativety factor associated with the quasi-distribution function is analyzed, providing information about the non-classicality nature of the superconductor state in the region closest to the edge of the superconducting material.