Absence of spin superradiance in resonatorless magnets

Details Absence of spin superradiance in resonatorless magnets Absence of spin superradiance in resonatorless magnets

2005-05-02

arxiv.org/abs/cond-mat/0505024v1

Laser Phys. Lett. 2 (2005) 302-308

Physics

Condensed Matter

Other Condensed Matter

Latex file, 14 pages, 5 figures

Scientific paper

A spin system is considered with a Hamiltonian typical of molecular magnets, having dipole-dipole interactions and a single-site magnetic anisotropy. In addition, spin interactions through the common radiation field are included. A fully quantum-mechanical derivation of the collective radiation rate is presented. An effective narrowing of the dipole-dipole attenuation, due to high spin polarization is taken into account. The influence of the radiation rate on spin dynamics is carefully analysed. It is shown that this influence is completely negligible. No noticeable collective effects, such as superradiance, can appear in molecular magnets, being caused by electromagnetic spin radiation. Spin superradiance can arise in molecular magnets only when these are coupled to a resonant electric circuit, as has been suggested earlier by one of the authors in Laser Phys. {\bf 12}, 1089 (2002).

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