Quantum magnetism and criticality

Details Quantum magnetism and criticality Quantum magnetism and criticality

2007-11-19

arxiv.org/abs/0711.3015v4

Nature Physics 4, 173 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

39 pages, 10 figures, review article for non-specialists; (v2) added clarifications and references; (v3) minor corrections; (v

Scientific paper

10.1038/nphys894

Magnetic insulators have proved to be fertile ground for studying new types of quantum many body states, and I survey recent experimental and theoretical examples. The insights and methods transfer also to novel superconducting and metallic states. Of particular interest are critical quantum states, sometimes found at quantum phase transitions, which have gapless excitations with no particle- or wave-like interpretation, and control a significant portion of the finite temperature phase diagram. Remarkably, their theory is connected to holographic descriptions of Hawking radiation from black holes.

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