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arXiv · 1610.01413

Chiral magnetoresistance in the Weyl semimetal NbP

Anna Corinna Niemann·Johannes Gooth·Shu-Chun Wu·Svenja Bäßler·Philip Sergelius·Ruben Hühne·Bernd Rellinghaus·Chandra Shekhar·Vicky Süß·Marcus Schmidt·Claudia Felser·Binghai Yan·Kornelius Nielsch
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Abstract

NbP is a recently realized Weyl semimetal (WSM), hosting Weyl points through which conduction and valence bands cross linearly in the bulk and exotic Fermi arcs appear. However, the most intriguing transport phenomenon of a WSM, the chiral anomaly-induced negative magnetoresistance (NMR) in parallel electric and magnetic fields, has yet to be observed in NbP. In intrinsic NbP the Weyl points lie far from the Fermi energy, making chiral magneto-transport elusive. Here, we use Ga-doping to relocate the Fermi energy in NbP sufficiently close to the Weyl points, for which the different Fermi surfaces are verified by resultant quantum oscillations. Consequently, we observe a NMR for parallel electric and magnetic fields, which is considered as a signature of the chiral anomaly in condensed-matter physics. The NMR survives up to room temperature, making NbP a versatile material platform for the development of Weyltronic applications.

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Anna Corinna Niemann, Johannes Gooth, Shu-Chun Wu, Svenja Bäßler, Philip Sergelius, Ruben Hühne, Bernd Rellinghaus, Chandra Shekhar, Vicky Süß, Marcus Schmidt, Claudia Felser, Binghai Yan, Kornelius Nielsch. 2016-10-05. Chiral magnetoresistance in the Weyl semimetal NbP. https://arxiv.org/abs/1610.01413

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