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Gil Gat

Publications and source records attributed to Gil Gat.

4 recordsLinked to original sources
arXiv1994

The Inhomogeneity Expansion for Planar Q.E.D in a Magnetic Background

The effective action for Q.E.D in external magnetic field is constructed using the method of inhomogeneity expansion. We first treat the non-relativistic case where a Chern-Simons like term is generated. We then consider the full relativistic theory and derive the effective action for the $A_μ$ fields. In the non-relativistic case we also add a 4-fermi type interaction and show that under certain circumstances, it corresponds to a Zeeman type term in the effective action.

hep-th↗
arXiv1994

Anomalous Magnetic Moment of Anyons

The anomalous magnetic moment of anyons is calculated to leading order in a 1/N expansion. It is shown that the gyromagnetic ratio g remains 2 to the leading order in 1/N. This result strongly supports that obtained in \cite{poly}, namely that g=2 is in fact exact.

hep-th↗
arXiv1994

Effective Interactions of Planar Fermions in a Strong Magnetic Field-the Effect of Landau Level Mixing

We obtain expressions for the current operator in the lowest Landau level (L.L.L.) field theory, where higher Landau level mixing due to various external and interparticle interactions is sytematically taken into account. We consider the current operators in the presence of electromagnetic interactions, both Coulomb and time-dependent, as well as local four-fermi interactions. The importance of Landau level mixing for long-range interactions is especially emphasized. We also calculate the edge-current for a finite sample.

hep-th↗