Mirror Protected Dirac Fermions on a Weyl Semimetal NbP Surface

Hao Zheng, Guoqing Chang, Shin Ming Huang, Cheng Guo, Xiao Zhang, Songtian Zhang, Jiaxin Yin, Su Yang Xu, Ilya Belopolski, Nasser Alidoust, Daniel S. Sanchez, Guang Bian, Tay Rong Chang, Titus Neupert, Horng Tay Jeng, Shuang Jia, Hsin Lin, M. Zahid Hasan

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Abstract

The first Weyl semimetal was recently discovered in the NbP class of compounds. Although the topology of these novel materials has been identified, the surface properties are not yet fully understood. By means of scanning tunneling spectroscopy, we find that NbP's (001) surface hosts a pair of Dirac cones protected by mirror symmetry. Through our high-resolution spectroscopic measurements, we resolve the quantum interference patterns arising from these novel Dirac fermions and reveal their electronic structure, including the linear dispersions. Our data, in agreement with our theoretical calculations, uncover further interesting features of the Weyl semimetal NbP's already exotic surface. Moreover, we discuss the similarities and distinctions between the Dirac fermions here and those in topological crystalline insulators in terms of symmetry protection and topology.

Original languageEnglish (US)
Article number196403
JournalPhysical review letters
Volume119
Issue number19
DOIs
StatePublished - Nov 8 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Zheng, H., Chang, G., Huang, S. M., Guo, C., Zhang, X., Zhang, S., Yin, J., Xu, S. Y., Belopolski, I., Alidoust, N., Sanchez, D. S., Bian, G., Chang, T. R., Neupert, T., Jeng, H. T., Jia, S., Lin, H., & Hasan, M. Z. (2017). Mirror Protected Dirac Fermions on a Weyl Semimetal NbP Surface. Physical review letters, 119(19), [196403]. https://doi.org/10.1103/PhysRevLett.119.196403