Spin-spin coupling-based quantum and classical phase transitions in two-impurity spin-boson models

• URL: http://arxiv.org/abs/2205.09367v1
• Date: Thu, 19 May 2022 08:01:03 GMT
• Title: Spin-spin coupling-based quantum and classical phase transitions in two-impurity spin-boson models
• Authors: Roberto Grimaudo, Antonino Messina, Hiromichi Nakazato, Alessandro Sergi, and Davide Valenti
• Abstract summary: Two-interacting-impurity spin-boson models with vanishing transverse fields on the spin-pair are studied. The dynamics of the magnetization is analysed for different levels of (an)isotropy.
• Score: 55.41644538483948
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: The class of two-interacting-impurity spin-boson models with vanishing transverse fields on the spin-pair is studied. The model can be exactly mapped into two independent standard single-impurity spin-boson models where the role of the tunnelling parameter is played by the spin-spin coupling. The dynamics of the magnetization is analysed for different levels of (an)isotropy. Further, the existence of a decoherence-free subspace as well as of both classical and quantum (first-order and Kosterlitz-Thouless type) phase transitions, in the Omhic regime, is brought to light.

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