Many-body interaction effects in Dirac-Weyl semimetals

02/03/2016 @ 11:00 AM – 12:00 PM Asia/Singapore Timezone
Physics Conference Room (S11-02-07)

Speaker: Edwin Barnes
Affiliation: Virginia Tech University, USA
Abstract Details: Dirac materials have been at the forefront of condensed matter research over the past decade following breakthroughs in graphene transport experiments. The relativistic-like linear dispersion of quasiparticles near the Dirac point leads to a variety of intriguing phenomena, among which are many-body interaction effects that both resemble and strongly contrast with quantum electrodynamics. Most notably, graphene experiments have revealed a strong Dirac cone squeezing effect due to electron-electron interactions. This and related phenomena can arise not only in graphene, but also in three-dimensional Dirac-Weyl semimetals, albeit with many qualitative differences due to the renormalization of both charge and Fermi velocity in three dimensions. I will describe our efforts to develop a quantitative and predictive theory of many-body phenomena in both graphene and 3D Dirac-Weyl semimetals.

About the Speaker: Professor Barnes' research interests span a number of topics in quantum condensed matter theory, including spin-based quantum computation, dynamical error suppression in quantum systems, driven non-equilibrium spin dynamics, non-equilibrium physics in 2D materials, many-body interactions in graphene, and novel topological materials such as topological insulators and Weyl semimetals. There is a particular emphasis on bridging formal, mathematical constructs with research that is closely connected to experiment.