Electron Spectroscopy and Hubbard: Issues and Opportunities

A fundamental theoretical characterization of a many-body system such as that defined by the Hubbard Hamiltonian is the single particle Green’s function G. Single particle electron spectroscopies provide a means to measure the spectral weight of G and so these spectroscopies are in principle a very powerful experimental means of testing theoretical predictions for the Hubbard model. This article gives an overview of problems and opportunities associated with the application of electron spectroscopy to this problem.