Review abstract

Nature Physics 4, 173 - 185 (2008)
Published online: 3 March 2008 | doi:10.1038/nphys894

Subject Categories: Condensed-matter physics | Quantum physics | Statistical physics, thermodynamics and nonlinear dynamics

Quantum magnetism and criticality

Subir Sachdev

Magnetic insulators have proved to be fertile ground for studying new types of quantum many-body state, and I survey recent experimental and theoretical examples. The insights and methods also transfer 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.

  1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Correspondence to: Subir Sachdev e-mail:


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