Developments in Correlated Fermions

TL;DR

This paper reviews recent experimental advances in heavy fermion systems and discusses theoretical understanding of their fermi-liquid states and quantum critical behavior, highlighting unresolved issues and systematic calculations.

Contribution

It provides a comprehensive overview of experimental developments and theoretical questions in correlated fermions, especially heavy fermions, from a major conference.

Findings

New experimental insights into heavy fermions

Understanding of fermi-liquid states in heavy fermions

Discussion of quantum critical points in correlated systems

Abstract

This manuscript is based on the Summary and Overview talk given at the "The International Conference of Strongly Correlated Electronic Systems" (SCES '04), July 26-30, at Karlsruhe, Germany. After highlighting some of the principal new experimental developments in heavy fermions presented at the conference, I turn to two kinds of theoretical questions. (1) What is understood of the fermi-liquid state of the heavy fermions and what is not, but may reasonably well be understood by systematic calculations. (2) The profound issues raised by the observed correlations near the quantum critical points in the heavy fermions. The numbers and letters in the parenthesis in the text refer to the listing of the talks in the "Program and Abstracts" book of the conference.