The vacua of dipolar cavity quantum electrodynamics

Year: 2020

Authors: Schuler M., De Bernardis D., Lduchli A., Rabl P.

Autors Affiliation: TU Wien, Atominst, Vienna Ctr Quantum Sci & Technol, A-1040 Vienna, Austria; Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria.

Abstract: The structure of solids and their phases is mainly determined by static Coulomb forces while the coupling of charges to the dynamical, i.e., quantized degrees of freedom of the electromagnetic field plays only a secondary role. Recently, it has been speculated that this general rule can be overcome in the context of cavity quantum electrodynamics (QED), where the coupling of dipoles to a single field mode can be dramatically enhanced. Here we present a first exact analysis of the ground states of a dipolar cavity QED system in the non-perturbative coupling regime, where electrostatic and dynamical interactions play an equally important role. Specifically, we show how strong and long-range vacuum fluctuations modify the states of dipolar matter and induce novel phases with unusual properties. Beyond a purely fundamental interest, these general mechanisms can be important for potential applications, ranging from cavity-assisted chemistry to quantum technologies based on ultrastrongly coupled circuit QED systems.

Journal/Review: SCIPOST PHYSICS

Volume: 9 (5)      Pages from: 66-1  to: 66-23

More Information: Funding information This work was supported by the Austrian Academy of Sciences (ÖAW) through a DOC Fellowship (D.D.) and by the Austrian Science Fund (FWF) through the DK CoQuS (Grant No. W 1210) and Grant No. P31701 (ULMAC). The computational results presented have been achieved [in part] using the Vienna Scientific Cluster (VSC).
KeyWords: Phase-transition; Molecules; Atoms; Order; Field
DOI: 10.21468/SciPostPhys.9.5.066

Citations: 24
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