Subir Sachdev , Harvard University
[Host: Seunghun Lee]
A central mystery posed by the Cu-based high temperature superconductors has been the nature of their electronic state at low hole density. I will survey the remarkable progress made by recent experiments towards solving this mystery. The experiments show that there is a density-wave order with d symmetry. This is distinct from the d symmetry of the wavefunction of the Cooper pairs responsible for the superconductivity. I will review theories which anticipated these developments.
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