Magnetotransport in topological metals

Event Date:
2019-04-16T12:00:00
2019-04-16T13:00:00
Event Location:
Room 309
Speaker:
Prof. Anton Burkov (University of Waterloo)
Related Upcoming Events:
Intended Audience:
Graduate
Local Contact:

Fei Zhou

Event Information:

Topological metals continue to attract attention as novel gapless states of matter. 
While there by now exists an exhaustive classification of possible topologically nontrivial metallic states, 
their observable properties, that follow from the electronic structure topology, are less well understood. 
In this talk I will present my recent work on magnetotransport phenomena in topological metals, which may be related to the 
chiral anomaly. I will demonstrate that the chiral anomaly leads to strong anisotropic magnetoresistance in such materials, 
which manifests in very unusual negative longitudinal magnetoresistance and planar Hall effect. I will also argue that a 
smoking-gun feature of the chiral anomaly in topological metals is the existence of propagating chiral density modes even 
in the regime of weak magnetic fields. Finally, I will show that the optical conductivity of such metals exhibits an
extra peak, which exists on top of the standard metallic Drude peak. The spectral weight of this peak is 
transferred from high frequencies and its width is proportional to the chiral charge relaxation rate.

Add to Calendar 2019-04-16T12:00:00 2019-04-16T13:00:00 Magnetotransport in topological metals Event Information: Topological metals continue to attract attention as novel gapless states of matter.  While there by now exists an exhaustive classification of possible topologically nontrivial metallic states,  their observable properties, that follow from the electronic structure topology, are less well understood.  In this talk I will present my recent work on magnetotransport phenomena in topological metals, which may be related to the  chiral anomaly. I will demonstrate that the chiral anomaly leads to strong anisotropic magnetoresistance in such materials,  which manifests in very unusual negative longitudinal magnetoresistance and planar Hall effect. I will also argue that a  smoking-gun feature of the chiral anomaly in topological metals is the existence of propagating chiral density modes even  in the regime of weak magnetic fields. Finally, I will show that the optical conductivity of such metals exhibits an extra peak, which exists on top of the standard metallic Drude peak. The spectral weight of this peak is  transferred from high frequencies and its width is proportional to the chiral charge relaxation rate. Event Location: Room 309