Growth and Magnetotransport in Thin Film α-Sn on CdTe

Abstract

We report growth and characterization of epitaxial $\alpha$-Sn thin films grown on CdTe(111)B. Noninvasive techniques verify the film's pseduomorphic growth before fabrication of magnetotransport devices, overcoming ex-situ obstacles on uncapped films for measurement in the Hall bar geometry. We identify a transition to metallic behavior at low temperature with large magnetoresistance, high mobility, and quantum oscillations tentatively suggesting an n-type Dirac semimetallic channel. A parallel p-type dopant channel with high carrier density is seen to dominate at thinner film thicknesses. Careful preparation of the CdTe surface before growth is considered crucial to attain a low dopant density and accessible topological states on an insulating substrate.

arXiv comment8 pages, 7 figures

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Cited by in corpus (3)

• Tailoring the topological surface state in ultrathin $\alpha$-Sn (111) films
• First Principles Assessment of CdTe as a Tunnel Barrier at the $\alpha$-Sn/InSb Interface
• 3D Topological Semimetal Phases of Strained $\alpha$-Sn on Insulating Substrate