Monday, October 26, 4 pm, Daly Science 206
Dirac and Weyl Semimetals: a Chemist's Approach
Dr. Mazhar Ali
Recent discoveries of massless-Dirac fermions and Weyl fermions in solid crystals have captured attention beyond the condensed matter physics community. These relatively simple materials realize fundamental particles, normally the preserve of high-energy experiments like CERN. The resulting explosion of research allows for important contributions from materials scientists, chemists, and others. Here I will introduce and overview the field from a chemist's point of view, with detailed consideration given to three materials: Cd3As2, the first 3D-"Dirac" Semimetal, WTe2, a type-II Weyl Semimetal, and ZrSiS, a new type of Dirac material. These materials show exceptional properties including largest magnetoresistance and one of the largest electron mobilities ever measured. Other properties of these materials as well as their potential technological applications will be discussed.