Physics Seminar Visualizing the chiral anomaly in Weyl-Dirac semimetals
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  • Physics Seminar Visualizing the chiral anomaly in Weyl-Dirac semimetals

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Title: Visualizing the chiral anomaly in Weyl and Dirac semimetals

Speaker: Jens Bardarson (Max Planck Institute for the Physics of Complex Systems)

Date/Time: April 29, 2015 Wednesday at 13:40

Place: Sabancı University, FENS L062

Abstract:
Quantum anomalies is the phenomena that a symmetry classically present
is broken in the quantum theory. The chiral anomaly, in particular,
refers to the non-conservation of chiral charge or current, and has
been discussed for example in the context of the electroweak
interactions and neutral superfluid helium. In the solid state, it has
recently been realized that Weyl and Dirac semimetals, in which the
conduction and valence points touch in a set of non-degenerate Weyl
nodes, have a chiral anomaly. In this context electrons with different
chirality belong to a different Weyl node, and the chiral anomaly is a
mechanism by which parallel electric and magnetic field pump charge
between different Weyl nodes. Due to disorder scattering a
characteristic non-equilibrium steady state is obtained. In this talk
I will discuss how this state is obtained, what are its defining
features, and how they can be experimentally observed in photoemission
spectroscopy.

contact: İnanç Adagideli adagideli@sabanciuniv.edu