Entrada Departamento Notícias Colloquium: QuantumMatter@PT - Adolfo G. Grushin, 29 October 2020,17:00

Colloquium: QuantumMatter@PT - Adolfo G. Grushin, 29 October 2020,17:00

Amorphous Topological Insulators: Theory and Experiment

Abstract

Amorphous solids remain outside of the classification and systematic discovery of new topological materials. This is because our interpretation of models and experiments in non-interacting topological matter strongly relies on symmetry, in particular the notion of a space group. Extending topological properties to amorphous topological matter could significantly increase the number of new topological materials, and be a promising route towards cheap and scalable topological devices. In this talk, I will discuss a possible way to extend the notion of symmetry indicators, usual labels of topology, to a class of amorphous topological models that I will introduce —- the Topological Weaire-Thorpe Models. These indicators are a promising starting point to build a complete classification scheme. Lastly, I will discuss how recent experiments in amorphous bismuth selenide, in particular transport and photoemission data, are consistent with the presence of a topological Dirac surface state, potentially turning this material into the first amorphous topological insulator ever observed.

Biographic Info

Adolfo Gonzalez Grushin is a theoretical physicist, specialist in three-dimensional topological phases of matter and quantum field theory applied to condensed matter physics. His most recent research interests transcend barriers between different branches in physics, ranging from transport properties of solids, to methods of dark matter detection using topological materials. Adolfo Grushin finished his PhD in 2013 at Universidad Autónoma de Madrid, under the supervision of Maria A. H. Vozmediano. Since then, he has held a postdoctoral position in the Max Planck Institute for the Physics of Complex Systems, Dresden, Germany (2013-2015), and a joint Marie Skłodowska-Curie fellowship (2015-2017) at the UC Berkeley and Oxford University, under the supervision of Joel Moore and Steve Simon, respectively. Since 2017, he holds a CR2 permanent research position at the Néel Institut (CNRS) in Grenoble, France, being the leader of theoretical topological matter group.

Webinar Link: https://videoconf-colibri.zoom.us/j/7738387607

29th October 2020 Online —- 17:00-18:00 GMT

Organizers: Pedro Ribeiro (IST), Eduardo V. Castro (UP), Bruno Amorim (UM) and João Viana Lopes (UP)

Co-organizers: Miguel Gonçalves (IST) and João Pedro S. Pires (UP)

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