Abstract
A system of magnetic molecules coupled to microwave cavities (LC resonators) undergoes the equilibrium superradiant phase transition. The transition is experimentally observable. The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model and then by the modification of the magnetic phase diagram of Fe_{8} dipolar crystals, exemplifying the cooperation between intrinsic and photon-induced spin-spin interactions. Finally, a transmission experiment is shown to resolve the transition, measuring the quantum electrodynamical control of magnetism.
Highlights
In 1973, Hepp and Lieb showed that N → ∞ polar molecules located inside a resonant electromagnetic cavity undergo a second order transition from a normal to a superradiant phase
The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model and by the modification of the magnetic phase diagram of Fe8 dipolar crystals, exemplifying the cooperation between intrinsic and photon-induced spin-spin interactions
This work explores the realization of the Dicke model, which undergoes the equilibrium superradiant phase transition (SPT), in a crystal of molecular nanomagnets coupled to a on-chip microwave cavity
Summary
In 1973, Hepp and Lieb showed that N → ∞ polar molecules located inside a resonant electromagnetic cavity undergo a second order transition from a normal to a superradiant phase. A system of magnetic molecules coupled to microwave cavities (LC resonators) undergoes the equilibrium superradiant phase transition.
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