Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Topological Semimetals II

TT 20.13: Vortrag

Montag, 12. März 2018, 18:15–18:30, A 053

Breakdown of the chiral anomaly in Weyl semimetals in a strong magnetic field — •Pilkwang Kim, Ji Hoon Ryoo, and Cheol-Hwan Park — Department of Physics, Seoul National University, Seoul 08826, Korea

A Weyl semimetal is a three-dimensional material whose low-energy quasiparticles are the chiral fermions described by the Weyl equation. One of the most intriguing phenomena of Weyl semimetals is the chiral anomaly, which is the nonconservation of the chiral charge in the presence of parallel electric and magnetic fields and has been understood as an imbalance between the occupations of the zeroth Landau levels with the opposite chiralities [1]. In this presentation, we report the breakdown of the chiral anomaly in Weyl semimetals in a strong magnetic field [2]. From first-principle calculations, we demonstrate that a sizable energy gap opens up due to the mixing of the zeroth Landau levels with opposite chiralities if an applied magnetic field is sufficiently strong. Our results provide a theoretical framework for understanding a wide range of phenomena related to the chiral anomaly in topological semimetals, such as magnetotransport, thermoelectric responses, and plasmons.
H. B. Nielsen, M. Ninomiya, Phys. Lett. B 130 (1983) 389.
P. Kim, J. H. Ryoo, C.-H. Park, arXiv 1707.01103 (2017).