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arXiv · 1903.06723

Growth and Magnetotransport in Thin Film {\alpha}-Sn on CdTe

Owen Vail·Patrick Taylor·Patrick Folkes·Barbara Nichols·George de Coster
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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.

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Owen Vail, Patrick Taylor, Patrick Folkes, Barbara Nichols, George de Coster. 2019-03-15. Growth and Magnetotransport in Thin Film {\alpha}-Sn on CdTe. https://doi.org/10.1002/pssb.201800513

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