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Special Seminar: Walid G. Malaeb - Photoemission spectroscopy studies on high-Tc superconductors and topological materials

May 31, 2024 | 03:00 PM c.t. - 05:00 PM
Walid G. Malaeb, Lebanese American University

Walid G. Malaeb, Lebanese American University

Department of Natural Sciences, Lebanese American University

Photoemission Spectroscopy (PES) is a powerful technique in directly probing the electronic structure of solids especially in its angle-resolved mode (ARPES). For this purpose, synchrotron radiation as well as high-resolution lasers and other light sources have been used.

In this talk, I will present how we have been implementing this technique to uncover various aspects of the electronic structure of quantum materials, in particular the iron-pnictide high-Tc superconductors from the early stage since their discovery in Japan in 2008.

The discussion will include the core energy levels, the three-dimensional electronic structure, the Fermi surfaces and superconducting gaps, the coupling to bosonic modes, etc.

I will also present our recent work on alpha-Sn which has recently gained much attention due to the diverse tunable topological phases it can reveal ranging from a topological insulator (TI) to a topological Dirac semimetal (TDS) depending on the applied strain in addition to its simple elemental structure, non-toxic nature and great potential for applications.

Finally, I will make a brief overview on the recent research projects we have launched at LAU.

Abstract

About Walid G. Malaeb

Walid G. Malaeb is an Assistant Professor of Physics at The Lebanese American University – LAU. He obtained a PhD in Physics from the Graduate School of Frontier Sciences at The University of Tokyo in 2009, and stayed at the same university as a project researcher at the Institute for Solid State Physics (ISSP) until 2015.

His research interests focus on investigating the electronic structure of novel materials like high-temperature superconductors and topological materials mainly using ARPES & XPS. He has also interest in studying nanomaterials. Currently he has several national and international collaborative research projects especially with Japan.

Time & Location

May 31, 2024 | 03:00 PM c.t. - 05:00 PM

Lecture Hall A (1.3.14)
Department of Physics
Arnimallee 14
14195 Berlin