Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.15: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Mirror anomaly induced anomalous Hall effect in ZrTe5 — •Yongjian Wang, Alexey Taskin, and Yoichi Ando — Institute of Physics II, University of Cologne, D-50937 Cologne, Germany

Dirac semimetals with band crossings (i.e., Dirac nodes) protected by combined inversion symmetry, time reversal symmetry and additional crystal symmetry attract lots of interest due to their interesting topological properties [1,2]. Besides chiral anomaly, a new topological phenomenon, mirror anomaly induced anomalous Hall effect was recently theoretically predicted in Dirac semimetals [3]. In a Dirac semimetal, when the Dirac nodes are at a time reversal invariant momentum, the anomalous Hall conductivity is predicted to exhibit a step-like change when the field is rotated.

ZrTe5 is a Dirac semimetal with only one Dirac point at the Γ point when the temperature is close to the resistivity peak temperature TP [4], which provides a good platform for observing the mirror-anomaly-induced anomalous Hall effect. We have grown ZrTe5 single crystals with very low TP and observed a clear anomalous Hall effect in these samples. We report the magnetic-field-orientation dependence of the anomalous Hall conductivity and discuss whether it is consistent with the theoretical prediction.

[1] S. M. Young, et al., Phys. Rev. Lett. 108.14: 140405 (2012)

[2] Z. J. Wang, et al., Phys. Rev. B 88.12: 125427 (2013).

[3] A. A. Burkov, Phys. Rev lett. 120.1: 016603 (2018).

[4] B. Xu, et al., Phys. Rev. lett. 121.18: 187401 (2018).

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