home > seminars 2016 > Ewin Barnes

Dr. Edwin Barnes
Department of Physics, Virginia Tech, Blacksburg, VA

Wednesday October 26, 3:30 PM
Thirkield Hall (Physics), room 103


Many-body effects and the chiral anomaly in Dirac-Weyl semimetals [PDF]

ABSTRACT: Dirac materials have been at the forefront of condensed matter research over the past decade following breakthroughs in graphene transport experiments. These materials host relativistic-like quasiparticles near the Dirac point at which the valence and conduction bands meet, leading to a variety of intriguing phenomena including many-body interaction effects that both resemble and strongly contrast with quantum electrodynamics. These and related phenomena can arise not only in graphene, but also in three-dimensional Dirac-Weyl semimetals, where both the charge and the velocity of quasiparticles get modified due to interactions. In the three-dimensional case, the existence of Dirac points is also predicted to give rise to exotic transport due to the chiral anomaly which has proven challenging to confirm experimentally. I will describe our efforts to reach a quantitative understanding of many-body phenomena and to develop new detectable signatures of the chiral anomaly in Dirac-Weyl materials.