Spin oscillations of relativistic fermions in the field of a traveling circularly polarized electromagnetic wave and a constant magnetic field

TL;DR

This paper investigates relativistic fermion behavior in combined electromagnetic and magnetic fields, revealing non-stationary states, spin dynamics, and connections to magnetic resonance, with implications for high-energy physics measurements.

Contribution

It introduces singular solutions of the Dirac equation in combined fields, analyzing their properties and the role of non-Galilean transformations in high-energy physics.

Findings

Disappearance of the longitudinal spin component.

States relate to classical magnetic resonance conditions.

Non-Galilean transformation parameters can be experimentally measured.

Abstract

The Dirac equation, in the field of a traveling circularly polarized electromagnetic wave and a constant magnetic field, has singular solutions, corresponding the expansion of energy in vicinity of some singular point. These solutions described relativistic fermions. States relating to these solutions are not stationary. The temporal change of average energy, momentum and spin for single and mixed states is studied in the paper. A distinctive feature of the states is the disappearance of the longitudinal component of the average spin. Another feature is the equivalence of the condition of fermion minimal energy and the classical condition of the magnetic resonance. Finding such solutions assumes the use of a transformation for rotating and co-moving frames of references. Comparison studies of solutions obtained with the Galilean and non-Galilean transformation shown that some parameters of the non-Galilean transformation may be measured in high-energy physics.