Recensiones

Contiene: GARCÍA BALLESTER, Luis, Los Moriscos y la medicina. Un capitulo de la medicina y la ciencia marginadas en la España del siglo XVI, documentos por Rosa Blasco y Luis García Ballester, Editorial Labor, Barcelona, 1984, 256 pp. / Míkel de Epalza ; LÓPEZ ELUM, Pedro, Los orígenes de la cerámica de Manises y Paterna (1285-1335), Manises y Paterna, 1984, 99 páginas / Rafael Azuar ; ROSSELLÓ PONS, Margalida, Les ceramiques almohades del Carrer de Zavellà Ciutat de Mallorca. Palma de Mallorca, 1983, 159 páginas / Rafael Azuar ; TORNERO POVEDA, Emilio, La disputa de los animales contra el hombre (traducción del original árabe de «La disputa del asno contra Fray Anselmo Turmeda»), Madrid, Editorial de la Universidad Complutense, 1984, 234 pp. / Míkel de Epalza ; VÁZQUEZ DE BENITO, María de la Concepción, Muḥammad b. Abdallāh b. al-Jatīb. K. al-Wuṣūl li-ḥifz al-ṣiḥḥa fi-l-fuṣūl. «Libro de la Higiene», Salamanca, Ediciones Universidad de Salamanca, 1984, 282-182 páginas. - Commentaria Averrois in Galenum, Madrid, Consejo Superior de Investigaciones Científicas (Instituto «Miguel Asín») e Instituto Hispano-Árabe de Cultura, 1984, XII. 341 páginas / Míkel de Epalza.

Colossal anisotropy in diluted magnetic topological insulators

We consider dilute magnetic doping in the surface of a three dimensional topological insulator where a two dimensional Dirac electron gas resides. We find that exchange coupling between magnetic atoms and the Dirac electrons has a strong and peculiar effect on both. First, the exchange-induced single ion magnetic anisotropy is very large and favors off-plane orientation. In the case of a ferromagnetically ordered phase, we find a colossal magnetic anisotropy energy, of the order of the critical temperature. Second, a persistent electronic current circulates around the magnetic atom and, in the case of a ferromagnetic phase, around the edges of the surface.

Topological spin waves in the atomic-scale magnetic skyrmion crystal

We study the spin waves of the triangular skyrmion crystal that emerges in a two-dimensional spin lattice model as a result of the competition between Heisenberg exchange, Dzyalonshinkii–Moriya interactions, Zeeman coupling and uniaxial anisotropy. The calculated spin wave bands have a finite Berry curvature that, in some cases, leads to non-zero Chern numbers, making this system topologically distinct from conventional magnonic systems. We compute the edge spin-waves, expected from the bulk-boundary correspondence principle, and show that they are chiral, which makes them immune to elastic backscattering. Our results illustrate how topological phases can occur in self-generated emergent superlattices at the mesoscale.