Introduction to Collective Excitations in Solids

M. Manninen, R. M. Nieminen, Martti J. Puska

Hermann Haken

Massimo V. Fischetti, William G. Vandenberghe

Alexey Tiranov, Vasiliki Angelopoulou, Cornelis Jacobus van Diepen +9 more

Photon emission is the hallmark of light-matter interaction and the foundation of photonic quantum science, enabling advanced sources for quantum communication and computing. Although single-emitter radiation can be tailored by the photonic environment, the introduction of multiple emitters extends this picture. A fundamental challenge, however, is that the radiative dipole-dipole coupling rapidly decays with spatial separation, typically within a fraction of the optical wavelength. We realize distant dipole-dipole radiative coupling with pairs of solid-state optical quantum emitters embedded in a nanophotonic waveguide. We dynamically probe the collective response and identify both super- and subradiant emission as well as means to control the dynamics by proper excitation techniques. Our work constitutes a foundational step toward multiemitter applications for scalable quantum-information processing.

Nicola Fabiano

Introduction/purpose: Quantum field theory techniques are able to describe precisely, inter alia, collective phenomena of statistical and solid state physics. Method: The path integral method with a Wick rotation shows its complete analogy with the partition function of statistical mechanics. Results: The Landau-Ginzburg phenomenology successfully describes collective phenomena such as spontaneous magnetization and super-conductivity. Conclusions: Symmetry breaking phenomena could give macroscopic results.

F. J. Kok