Questions and Issues Arising at SCES '94 Theory

TL;DR

This paper summarizes key questions and issues discussed at the 1994 SCES conference, covering topics like electron interactions, non-Fermi liquid behavior, and heavy fermion superconductivity, highlighting ongoing challenges in understanding strongly correlated electron systems.

Contribution

It provides a comprehensive overview of unresolved questions and debates in the field of strongly correlated electron systems as of 1994.

Findings

Discussion of Hund's rule interactions and their renormalization

Analysis of the Luttinger sum rule and metamagnetism

Insights into non-Fermi liquid behavior and heavy fermion superconductivity

Abstract

I summarize some of the key questions to have emerged during the 1994 conference on ``Strongly Correlated Electron Systems'', held in Amsterdam, August 1994. Issues addressed include: Hunds rule interactions and how they renormalize; the Luttinger sum rule and metamagnetism; heavy fermion insulators, the nature of the charge gap, spectral weight transfer in the optical conductivity; non-Fermi liquid behavior in transition and heavy fermion metals; order parameter symmetry and the unusual nature of quasiparticle excitations in heavy fermion superconductors.