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Klaus Morawetz: Anomalous transport in Weyl systems and graphene normally explained

December 13, 2018 @ 14:00 - 15:00

Nano Seminar

joint with
Seminar of Condensed State Theory

Thursday, 13.12. 2018, 14.00,

Lecture room F2 (1st floor), MFF UK, Ke Karlovu 5

Prof. Dr. Klaus Morawetz

Muenster University of Applied Sciences, Germany

Anomalous transport in Weyl systems and graphene normally explained

Te anomalous term in the balance of the chiral density can be rewritten as quantum current and does not violate classical conservation laws as it is claimed to be caused by quantum fluctuations. Moreover this term is derived from the quantum kinetic equations for systems with SU(2) structure within a completely conserving approach. Therefore the origin of this term is not a unique signal of symmetry-breaking terms in the field theoretical Lagrangian. Regularization-free density and pseudospin currents are calculated in Graphene and Weyl-systems realized as the infinite-mass limit of electrons with quadratic dispersion and a proper spin-orbit coupling. The intraband and interband conductivities are discussed and the optical conductivity agrees well with the experimental values using screened impurity scattering and an effective Zeeman field. The universal value of Hall conductivity is shown to be modified due to the Zeeman field.

Details

Date:
December 13, 2018
Time:
14:00 - 15:00
Event Category:
Website:
http://kfkl.cz/cs/component/seminar/?task=3&cid=368

Organizers

Prof. RNDr. Václav Holý, CSc.
RNDr. Milan Dopita, Ph.D.
RNDr. Tomáš Novotný, Ph.D.

Venue

Lecture room F2, Ke Karlovu 5
Ke Karlovu 5
Prague 2, 121 16 Czech Republic
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