Title: Topological semimetal state and field-induced Fermi surface reconstruction in antiferromagnetic monopnictide NdSb,
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.