TL;DR
This paper reviews the fundamental theories of quantum criticality and their experimental relevance to correlated electron systems, providing an updated synthesis with additional literature citations.
Contribution
It offers a comprehensive overview of quantum criticality theories with recent literature updates, bridging theory and experiments in correlated electron materials.
Findings
Summarizes key theoretical frameworks of quantum criticality.
Connects theories to experimental observations in correlated electron compounds.
Provides updated references and literature context.
Abstract
This is a review of the basic theoretical ideas of quantum criticality, and of their connection to numerous experiments on correlated electron compounds. A shortened, modified, and edited version appeared in Physics Today. This arxiv version has additional citations to the literature.
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