%0 Journal Article %J Physical Review Letters %D 2012 %T Steady-state many-body entanglement of hot reactive fermions %A Michael Foss-Feig %A Andrew J. Daley %A James K. Thompson %A Ana Maria Rey %X Entanglement is typically created via systematic intervention in the time evolution of an initially unentangled state, which can be achieved by coherent control, carefully tailored non-demolition measurements, or dissipation in the presence of properly engineered reservoirs. In this paper we show that two-component Fermi gases at ~\mu K temperatures naturally evolve, in the presence of reactive two-body collisions, into states with highly entangled (Dicke-type) spin wavefunctions. The entanglement is a steady-state property that emerges---without any intervention---from uncorrelated initial states, and could be used to improve the accuracy of spectroscopy in experiments with fermionic alkaline earth atoms or fermionic groundstate molecules. %B Physical Review Letters %V 109 %8 2012/12/4 %G eng %U http://arxiv.org/abs/1207.4741v1 %N 23 %! Phys. Rev. Lett. %R 10.1103/PhysRevLett.109.230501