Resumen: There is an intimate relation between entanglement entropy and Riemann surfaces. This fact is explicitly noticed for the case of quadratic fermionic Hamiltonians with finite range couplings. After recollecting this fact, we make a comprehensive analysis of the action of the Möbius transformations on the Riemann surface. We are then able to uncover the origin of some symmetries and dualities of the entanglement entropy already noticed recently in the literature. These results give further support for the use of entanglement entropy to analyse phase transitions. Idioma: Inglés DOI: 10.1088/1742-5468/2016/04/043160 Año: 2016 Publicado en: JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT 2016, April (2016), 043106 [25 pp.] ISSN: 1742-5468 Factor impacto JCR: 2.196 (2016) Categ. JCR: PHYSICS, MATHEMATICAL rank: 8 / 55 = 0.145 (2016) - Q1 - T1 Categ. JCR: MECHANICS rank: 38 / 133 = 0.286 (2016) - Q2 - T1 Factor impacto SCIMAGO: 0.581 - Statistical and Nonlinear Physics (Q3) - Statistics, Probability and Uncertainty (Q3) - Statistics and Probability (Q3)