### Abstract

We introduce a technique to compare different, but related, quantum systems, thereby generalizing the way that coherent states are used to compare quantum systems to classical systems in semiclassical analysis. We then use this technique to estimate the dependence of the free energy of the quantum Heisenberg model on the spin value, and to estimate the relation between the ferromagnetic and antiferromagnetic free energies.

Original language | English (US) |
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Pages (from-to) | 145-154 |

Number of pages | 10 |

Journal | Letters in Mathematical Physics |

Volume | 22 |

Issue number | 2 |

DOIs | |

State | Published - Jun 1 1991 |

### All Science Journal Classification (ASJC) codes

- Statistical and Nonlinear Physics
- Mathematical Physics

### Keywords

- AMS subject classifications (1991): 81R30, 81S30

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## Cite this

Lieb, E., & Solovej, J. P. (1991). Quantum coherent operators: A generalization of coherent states.

*Letters in Mathematical Physics*,*22*(2), 145-154. https://doi.org/10.1007/BF00405179