Spin superradiance versus atomic superradiance

TL;DR

This paper compares spin superradiance and atomic superradiance, highlighting their fundamental differences in mechanisms, and discusses the potential for realizing superradiance in molecular magnets via resonant circuits.

Contribution

It clarifies the distinct physical mechanisms behind spin and atomic superradiance, emphasizing the non-collective nature of spin interactions and exploring experimental possibilities.

Findings

Atomic superradiance is a self-organized process driven by spontaneous emission.

Spin systems with dipole interactions do not exhibit collective effects through radiation.

Coupling molecular magnets to resonant circuits could enable superradiance in spin systems.

Abstract

A comparative analysis is given of spin superradiance and atomic superradiance. Their similarities and distinctions are emphasized. It is shown that, despite a close analogy, these phenomena are fundamentally different. In atomic systems, superradiance is a self-organized process, in which both the initial cause, being spontaneous emission, as well as the collectivizing mechanism of their interactions through the common radiation field, are of the same physical nature. Contrary to this, in actual spin systems with dipole interactions, the latter are the major reason for spin motion. Electromagnetic spin interactions through radiation are negligible and can never produce collective effects. The possibility of realizing superradiance in molecular magnets by coupling them to a resonant circuit is discussed.