The quantum phase transitions of metals – Niels Bohr Institute - University of Copenhagen

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The quantum phase transitions of metals

Almost all correlated electron metals exhibit instabilities to ordered phases with broken spin or lattice symmetries:
prominent examples are found in the cuprates, the pnictides, and in many rare-earth intermetallics. Such phase transitions were classified and studied in a classic paper by Hertz in 1976. I will argue that while the Hertz approach is largely correct in spatial dimension d=3, new strong-coupled field theories are required in the experimentally important case of d=2.
I will describe recent progress towards solution of these strong coupling problems.

Talk by Subir Sachdev