Molecular beam epitaxy of three-dimensionally thick Dirac semimetal Cd3As2 films

Abstract

Rapid progress of quantum transport study in topological Dirac semimetal, including observations of quantum Hall effect in two-dimensional (2D) Cd${}_3$As${}_2$ samples, has uncovered even more interesting quantum transport properties in high-quality and three-dimensional (3D) samples. However, such 3D Cd${}_3$As${}_2$ films with low carrier density and high electron mobility have been hardly obtained. Here we report the growth and characterization of 3D thick Cd${}_3$As${}_2$ films adopting molecular beam epitaxy. The highest electron mobility ($\mu$ = 3 $\times$ 10${}^4$ cm${}^2$/Vs) among the reported film samples has been achieved at a low carrier density ($\text{n}=5$ $\times$ 10${}^{16}$ cm${}^{-3}$). In the magnetotransport measurement, Hall plateau-like structures are commonly observed in spite of the 3D thick films ($\text{t}=120$ nm). On the other hand, field angle dependence of the plateau-like structures and corresponding Shubunikov-de Haas oscillations rather shows a 3D feature, suggesting the appearance of unconventional magnetic orbit, also distinct from the one described by the semiclassical Weyl-orbit equation.

11 pages, 3 figures + supplementary 6 pages, 3 figures

References in corpus (8)

• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Observation of the quantum Hall effect in confined films of the three-dimensional Dirac semimetal Cd3As2
• Quantum Hall states observed in thin films of Dirac semimetal Cd3As2
• Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2
• Transient reflectance of photoexcited Cd${}_3$As${}_2$

Cited by in corpus (2)

• Enhancement of spin-orbit coupling in Dirac semimetal Cd${}_3$As${}_2$ films by Sb-doping
• Molecular beam deposition of a new layered pnictide with distorted Sb square nets