Magnetically ordered materials tend to support bands of coherent propagating spin wave, or magnon, excitations. Topologically protected surface states of magnons offer a new path towards coherent spin transport for spintronics applications. In this work we explore the variety of topological magnon band structures and provide insight into how to efficiently identify topological magnon bands in materials. We do this by adapting the topological quantum chemistry approach that has used constraints imposed by time reversal and crystalline symmetries to enumerate a large class of topological electronic bands. We show how to identify physically relevant models of gapped magnon band topology by using so-called decomposable elementary band representations, and in turn discuss how to use symmetry data to infer the presence of exotic symmetry enforced nodal topology.
We report a case of two consecutive pregnancies in a patient where a Fontan connection, a cardiac procedure used since 1971 to provide palliation for patients that cannot support a biventricular circulation was used. Here we analyze the anesthesiological and obstetrical aspects particularly regarding some cardiovascular problems that occurred during the pregnancy and delivery.
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