# Non-topological Origin of the Planar Hall Effect in Type-II Dirac Semimetal NiTe2

## TL;DR

This study shows that the planar Hall effect observed in NiTe2, a type-II Dirac semimetal, originates from trivial orbital magnetoresistance rather than chiral anomaly, challenging previous assumptions about PHE as a topological indicator.

## Contribution

It demonstrates that PHE in NiTe2 is due to non-topological effects, emphasizing the need to distinguish trivial contributions from topological phenomena in such materials.

## Key findings

- PHE observed in NiTe2 at low temperatures.
- PHE arises from trivial orbital magnetoresistance.
- PHE is not exclusively indicative of chiral anomaly.

## Abstract

Dirac and Weyl semimetals are new discovered topological nontrivial materials with the linear band dispersions around the Dirac/Weyl points. When applying non-orthogonal electric current and magnetic field, an exotic phenomenon called chiral anomaly arises and negative longitudinal resistance can be detected. Recently, a new phenomenon named planer Hall effect (PHE) is considered to be another indication of chiral anomaly which has been observed in many topological semimetals. However, it still remains a question that is the PHE only attributed to chiral anomaly? Here we demonstrate the PHE in a new-discovered type-II Dirac semimetal NiTe2 by low temperature transport. However, after detailed analysis, we conclude that the PHE results from the trivial orbital magnetoresistance. This work reveals that PHE is not a sufficient condition of chiral anomaly and one need to take special care of other non-topological contribution in such studies.

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Source: https://tomesphere.com/paper/1901.01749