Topological semimetal state and field-induced Fermi surface reconstruction in antiferromagnetic monopnictide NdSb
Yongjian Wang, J. H. Yu, Y. Q. Wang, C. Y. Xi, L. S. Ling, S. L., Zhang, J. R. Wang, Y. M. Xiong, Tao Han, Hui Han, Jun Yang, Jixiang Gong, Lei, Luo, W. Tong, Lei Zhang, Zhe Qu, Y. Y. Han, W. K. Zhu, Li Pi, X. G. Wan,, Changjin Zhang, Yuheng Zhang
TL;DR
This paper reports the experimental discovery of a Dirac semimetal state in antiferromagnetic NdSb, supported by band calculations and negative magnetoresistance, with a field-induced Fermi surface reconstruction linked to spin polarization changes.
Contribution
First experimental realization of a topological semimetal state in a magnetic material, NdSb, combining topological and magnetic properties for studying magneto-topological phenomena.
Findings
Observation of Dirac semimetal state in NdSb
Detection of chiral anomaly induced negative magnetoresistance
Field-induced Fermi surface reconstruction
Abstract
We report the experimental realization of Dirac semimetal state in NdSb, a material with antiferromagnetic ground state. The occurrence of topological semimetal state has been well supported by our band structure calculations and the experimental observation of chiral anomaly induced negative magnetoresistance. A field-induced Fermi surface reconstruction is observed, in response to the change of spin polarization. The observation of topological semimetal state in a magnetic material provides an opportunity to investigate the magneto-topological phenomena.
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