Compensating fields in the Landau local theory and phenomenological description of the electron-phonon interaction

TL;DR

This paper develops a Landau theory incorporating compensating fields to describe inhomogeneous states with local translation symmetry, providing a new phenomenological framework for electron-phonon interactions and superconducting states.

Contribution

It introduces a phonon potential as a 4-distortion tensor within the Landau theory, linking local translation symmetry to electron-phonon interactions and superconducting gap symmetries.

Findings

Defined the phonon potential as a 4-distortion tensor.

Derived equations of motion for particles in a phonon field.

Compared nonlinear Landau theory with gauge theory of dislocations.

Abstract

We study inhomogeneous states with local translation symmetry, described by the order parameter (OP) with local transformation properties k=k(X). It is shown that in the OP extended derivative we should consider compensating field which is equivalent to the distortion tensor. The definition of the phonon potential as a 4-distortion tensor is given and equations of motion of a particle in a phonon field are obtained. We construct the Ginzburg-Landau potential, which clearly describes the electron-phonon interaction and gives the correct definition of the quantum of magnetic flux without doubling the phenomenological charge interaction. The description of the states with the d-symmetry of the wave superconducting gap by the lowsymmetric solutions is suggested, in which the inversion of space-time is not equivalent to the OP complex conjugation. A comparative analysis of the nonlinear Landau theory with the compensating field distortion and the Kadi\'c-Edelen linear gauge theory of dislocations is performed. It was demonstrated that the minimal interaction is a consequence of local wave properties of OP, which is consistent with the basic principles of quantum mechanics.