par Zhu, Yan Qing;Goldman, Nathan 
;Palumbo, Giandomenico
Référence Physical Review B, 102, 8, 081109
Publication Publié, 2020-08-01
;Palumbo, Giandomenico Référence Physical Review B, 102, 8, 081109
Publication Publié, 2020-08-01
Article révisé par les pairs
| Résumé : | Quantum anomalies offer a useful guide for the exploration of transport phenomena in topological semimetals. In this work, we introduce a model describing a semimetal in four spatial dimensions, whose nodal points act like tensor monopoles in momentum space. This system is shown to exhibit monopole-to-monopole phase transitions, as signaled by a change in the value of the topological Dixmier-Douady invariant as well as by the associated surface states on its boundary. We use this model to reveal an intriguing "4D parity magnetic effect,"which stems from a parity-type anomaly. In this effect, topological currents are induced upon time modulating the separation between the fictitious monopoles in the presence of a magnetic perturbation. Besides its theoretical implications in both condensed matter and quantum field theory, the peculiar four-dimensional (4D) magnetic effect revealed by our model could be measured by simulating higher-dimensional semimetals in synthetic matter. |
