Abstract
In this work, we investigate the effects of a nontrivial topology (and geometry) of a system considering interacting and noninteracting particle modes, which are restricted to follow a closed path over the torus surface. In order to present a prominent thermodynamical investigation of this system configuration, we carry out a detailed analysis using statistical mechanics within the grand canonical ensemble approach to deal with noninteracting fermions. In an analytical manner, we study the following thermodynamic functions in such context: the Helmholtz free energy, the mean energy, the magnetization and the susceptibility. Further, we take into account the behavior of Fermi energy of the thermodynamic system. Finally, we briefly outline how to proceed in case of interacting fermions.
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Notes
Note that the procedure used here to carried out the factorization is not a general result. It suits only for the results presented in this paper.
It should be noted that we have considered a magnetic field which, in technical terms, is referred as the solenoidal magnetic field (uniform magnetic field pointing in the \(\varvec{\hat{z}}\) direction). Nevertheless, for a particle on a torus knot, two other forms of magnetic field, referred to as toroidal (along the \(\varvec{\hat{\phi }}\) direction) and poloidal (along the \(\varvec{\hat{\theta }}\) direction) forms are also relevant. If one is interested in more details ascribed to them, please see Ref. [33].
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Acknowledgements
Particularly, A. A. Araújo Filho acknowledges the Facultad de Física-Universitat de València and Gonzalo J. Olmo for the kind hospitality when part of this work was made. Moreover, this work was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-142412/2018-0, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-Finance Code 001, and CAPES-PRINT (PRINT - PROGRAMA INSTITUCIONAL DE INTERNACIONALIZAÇÃO) - 88887.508184/2020-00.
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Araújo Filho, A.A., Reis, J.A.A.S. & Ghosh, S. Fermions on a torus knot. Eur. Phys. J. Plus 137, 614 (2022). https://doi.org/10.1140/epjp/s13360-022-02828-y
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DOI: https://doi.org/10.1140/epjp/s13360-022-02828-y