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Energy flow in quantum critical systems far from equilibrium

Research output: Contribution to journalArticle

M. J. Bhaseen, Benjamin Doyon, Andrew Lucas, Koenraad Schalm

Original languageEnglish
Pages (from-to)509-514
Number of pages6
JournalNature Physics
Issue number6
Publication statusPublished - 4 Jun 2015

King's Authors


Characterizing the behaviour of strongly coupled quantum systems out of equilibrium is a cardinal challenge for both theory and experiment. With diverse applications ranging from the dynamics of the quark-gluon plasma to transport in novel states of quantum matter, establishing universal results and organizing principles out of equilibrium is crucial. We present a universal description of energy transport between quantum critical heat baths in arbitrary dimension. The current-carrying non-equilibrium steady state (NESS) is a Lorentz-boosted thermal state. In the context of gauge/gravity duality this reveals an intimate correspondence between far-from-equilibrium transport and black hole uniqueness theorems. We provide analytical expressions for the energy current and the generating function of energy current fluctuations, together with predictions for experiment.

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