Abstract
This work demonstrates that Dirac semimetal like transport properties can be observed in high quality, epitaxial Bi0.96Sb0.04 films grown by two-step growth method using molecular beam epitaxy. A large linear magnetoresistance (MR) of 825% (7 T, 1.8 K) and nonlinear Hall resistivity were observed, which indicate the presence of high mobility conducting layers that correspond to topological semimetallic layers. A field-induced semimetal-semiconductor transition appeared, which is a unique characteristic of Dirac semimetals. Large negative MR was also observed when the magnetic field was parallel to the current direction due to the chiral anomaly related to topological magnetoelectric effects. These transport phenomena are typical signatures of Dirac semimetals, which suggests that epitaxial Bi0.96Sb0.04 films can be regarded as Dirac semimetals.
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