Coupling function from bath density of states

@article{Nemati2022CouplingFF,
  title={Coupling function from bath density of states},
  author={Somayyeh Nemati and Carsten Henkel and Janet Anders},
  journal={Europhysics Letters},
  year={2022},
  volume={139}
}
Modelling of an open quantum system requires knowledge of parameters that specify how it couples to its environment. However, beyond relaxation rates, realistic parameters for specific environments and materials are rarely known. Here we present a method of inferring the coupling between a generic system and its bosonic (e.g., phononic) environment from the experimentally measurable density of states (DOS). With it we confirm that the DOS of the well-known Debye model for three-dimensional… 

Quantum Brownian motion for magnets

Spin precession in magnetic materials is commonly modelled with the classical phenomenological Landau–Lifshitz–Gilbert (LLG) equation. Based on a quantized three-dimensional spin + environment

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