Guests and Visitors

We welcome today's guest, Babak Seradjeh, from Indiana University, who is an expert in topological insulators and superconductors, Majorana fermions in condensed matter systems, and realization and manipulation of fractional particles.
He will be discussing Universal fluctuations of Floquet topological invariants at low frequencies.  Please join us to hear about the newest development in this hot topic.

We welcome today's guest, Igor Lukyanchuk, from Laboratorie de Physique des Solides, University of Picardy, (Amien, France) who is an expert in ferroelectrics and multiferroic materials.
He will be discussing Topological excitations in nano-scale ferroelectrics.  Please join us to hear about the newest development in this hot topic.The presentation of talk can be found here.

We welcome today's guest, Andre Thiaville, from Laboratorie de Physique des Solides ORSAY. He will be discussing Skyrmion in symmetric bilayers.  Please join us to hear about the newest development in this hot topic. Presentation of his talk you can find here.

Prof. Jairo Sinova and Bertrand Dupé are visiting the group of Prof. Paul Kelly at the University of Twente for a couple of days. It is a pleasure to visit the group of Prof. Kelly and benefit from his long experience in spin transport calculations from ab initio.

 

This week, we are very pleased to host Dr. Bernd Zimmernann from the group of Prof. Yuriy Mokrousov from Forschungszentrum Jülich. He will teach us about spin-orbit effects from ab-initio theory.

We welcome Eric Bousquet from the Abinit team who will be giving the seminar today. We look forward to future collaborations with his team.

We welcome today Dr. Oliver Breunig from the Institute of Physics II at the University of Cologne, hosted by TWIST. He will give a talk on “Gigantic Negative Magnetoresistance in a Disordered Topological Insulator”.

Details: “Recently the phenomenon of negative magnetoresistance (MR) is attracting renewed interest due to its occurrence in Weyl semimetals because of the chiral anomaly. In other systems a large MR typically relates to magnetism. In this talk a novel mechanism leading to a large negative MR will be presented that is based not on magnetism, but on disorder. In the newly synthesized bulkinsulating topological insulator material T1BixSb1-xTe2 we find a suppression of the resistivity by up to 98 % in 14 T at low temperature. From transport data and numerical simulations, this gigantic negative MR is understood by a percolation of charge puddles formed in the disordered bulk.”

Click here to see the announcement.

The TWIST and INSPIRE guest Davi R. Rodrigues from the Department of Physics & Astronomy, Texas A&M University gives a talk on “Effective Description of Topological Magnetic Textures”.

We welcome today's seminar speaker, Roman Kovakick, from Jülich, who will be discussing Spin disorder and transport in magnetic materials from an abi-initio perspective.

For more details see the abstract here.

Today, we have the pleasure to welcome Filipe Guimarães from Forschungszentrum Jülich as our speaker. He will talk about "Dynamical amplification of magnetoresistances and Hall currents up to the THz regime" and stay with us until tomorrow for more discussions about the tight-binding method and modeling of spin transport phenomena.