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Strange metals develop near quantum critical points (QCPs) in a variety ofstrongly correlated systems. Some of the important issues include how thequantum critical state loses quasiparticles, how it drives superconductivity,and to what extent the strange-metal physics in different classes of correlatedsystems are connected with each other. In this article, we confront some ofthese issues from the vantage point of heavy fermion metals. We will describethe notion of Kondo destruction and how it leads to a transformation of theFermi surface from ``large" to ``small" across the QCP, a loss ofquasiparticles everywhere on the Fermi surface at the QCP, and a dynamicalPlanckian scaling in various properties including charge responses. We closewith a brief discussion about the connections between the strange-metal physicsin heavy fermion metals and its counterparts in the cuprates and othercorrelated materials.

Quantum Critical Metals: Dynamical Planckian Scaling and Loss of Quasiparticles