Tunable Plasmonic Ultrastrong Coupling: Emulating Dicke Physics at Room Temperature
Abstract
A system of N two-level atoms cooperatively interacting with a photonic field can be described as a single giant atom coupled to the field with interaction strength ~N^0.5. This enhancement, known as Dicke cooperativity in quantum optics, has recently become an indispensable element in quantum information technology based on strong light-matter coupling. Here, we extend the coupling beyond the standard light-matter interaction paradigm, emulating Dicke cooperativity in a terahertz metasurface with N meta-atoms. Cooperative enhancement manifested in the form of matter-matter coupling, through the hybridization of localized surface plasmon resonance in individual meta-atoms and surface lattice resonance due to the periodic array of the meta-atoms. By varying the lattice constant of the array, we observe a clear anticrossing behavior, a signature of strong coupling. Furthermore, through engineering of the capacitive split-gap in the meta-atoms, the coupling rate was cooperatively enhanced into the ultrastrong coupling regime by a factor of N^0.5. This room-temperature technology serves as a convenient quantum emulator of the dynamics of a qubit with a giant dipole moment coherently driven by a single bosonic field.
Cite
@article{arxiv.2108.02494,
title = {Tunable Plasmonic Ultrastrong Coupling: Emulating Dicke Physics at Room Temperature},
author = {Riad Yahiaoui and Zizwe A. Chase and Chan Kyaw and Fuyang Tay and Andrey Baydin and G. Timothy Noe and Junyeob Song and Junichiro Kono and Amit Agrawal and Motoaki Bamba and Thomas A. Searles},
journal= {arXiv preprint arXiv:2108.02494},
year = {2022}
}
Comments
The preprint was withdrawn by the authors due to a change in scope of the work which focuses on Dicke-assisted enhancement