Aalto Physics Colloquium: Professori Bogdan Andrei Bernevig

Image: B.A. Bernevig

Tervetuloa ensimmäisen Aalto Physics Colloquium 2020, jonka aloittaa professori Bogdan Andrei Bernevig aiheella "Topological Quantum Chemistry and The Topological Periodic Table of Material". Tapahtuma on torstaina 9. tammikuuta klo 14.00-15.00.

Coffee and cake will be served after the presentation, from 15.00 - 15.30. Please register here if you plan to attend, so that we have enough refreshments for all!

Our distinguished guest, Prof. Bogdan Andrei Bernevig, Professor of Physics at Princeton University, will present his research on "Topological Quantum Chemistry and The Topological Periodic Table of Material".

Colloquium abstract: 

One newly discovered characterization of insulators, metals and semimetals is based on their topological properties. Topological insulators do not conduct in the bulk but, unlike their non-Topological counterparts, exhibit perfect conduction on their surface. Topological metals conduct in the bulk, but, unlike their non-Topological counterparts cannot be gapped due to a special type of  protection that allows their low energy electrons to exhibit esoteric phenomena such as chiral anomaly or non-local transport. It was initially thought that the materials exhibiting these phenomena are very special and unique amongst all of the 140000 compounds known to humankind. We will present a review of these ideas and properties of topological materials. We will then show how, using a Topological Quantum Chemistry, we are able to now catalogue a large subset (35000) of all the topological materials that can possibly exist in nature. We then apply our theory to find that more than 40% of all known compounds - including some of the most interesting materials in nature - are actually topological. We hence live in a topological world! We will give examples of new states, including fragile states, twisted Moire patterns, and hinge arcs, that have all been discovered to exhibit topological properties. 

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