Non-crystalline topological matter

CFM Seminars

Adolfo Grushin
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel
CFM Auditorium
Ivo Souza
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Non-crystalline topological matter

Topological phases are remarkable because of their  propagating surface states resistant to disorder and their  universally quantised responses to electromagnetic fields.  Topological phenomena are by now ubiquitously observed in  crystals, both in solids and synthetic systems. In contrast,  topology in non-crystalline matter, such as amorphous or  quasicrystalline materials, is much harder to predict, diagnose  and discover. This is because crystalline periodicity is central  to how we understand topological materials, although it is not  necessary to define topological phases. In this talk I will  present recent theoretical understanding of amorphous topological  matter. I will use amorphous Bismuth selenide as an example for  tools to predict them and characterise them. I will finish by  discussing their potential to host novel and controllable  topological phenomena.