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Statistical thermodynamics of the Frohlich-Bose-Einstein condensation of magnons out of equilibrium

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Autor(es):
Vannucchi, Fabio Stucchi [1] ; Luzzi, Roberto [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ UNESP, Inst Biosci, BR-11380972 Sao Vicente, SP - Brazil
[2] State Univ Campinas UNICAMP, Inst Phys Gleb Wataghin, Condensed Matter Phys Dept, BR-13083859 Campinas, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Physical Review E; v. 100, n. 3 SEP 18 2019.
Citações Web of Science: 0
Resumo

This work presents a nonequilibrium statistical-thermodynamic approach to the study of a Frohlich-Bose-Einstein condensation of magnons under radio-frequency radiation pumping. Frohlich-Bose-Einstein condensates display a complex behavior consisting in steady-state conditions to the emergence of a synergetic dissipative structure resembling the Bose-Einstein condensation of systems in equilibrium. Then a kind of ``two-fluid model{''} arises: the ``normal{''} nonequilibrium structure and the Frohlich condensate, which is shown to be an attractor to the system. In this study we analyze some aspects of the irreversible thermodynamics of this dissipative complex system. We obtained the expression for the informational entropy of the two-fluid condensate and introduced an order parameter to characterize the role of the Frohlich interaction in ordering the system. The analysis highlights the order increase due to the Frohlich interaction. We also study the informational entropy production of the system, considering its internal and external parts. Finally, the Glansdorff-Prigogine criteria for evolution and (in) stability are verified. (AU)

Processo FAPESP: 11/14341-9 - Termodinâmica estatística dè não-equilíbrio dè magnons excitados
Beneficiário:Fabio Stucchi Vannucchi
Linha de fomento: Bolsas no Brasil - Pós-Doutorado