Thin film TaAs: developing a platform for Weyl semimetal devices

J N Nelson, A D Rice, R Kurleto, A Shackelford, Z Sierzega, P Hao, B Berggren, C-S Jiang, A G Norman, M E Holtz, J S Mangum, I A Leahy, K N Heinselman, Herve Ness, Mark Van Schilfgaarde, D S Dessau, K Alberi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


MX monopnictide compounds (M = Nb,Ta, X = As,P) are prototypical 3D Weyl semimetals (WSMs) that have been shown in bulk single crystal form to have potential for a wide variety of novel devices due to topologically protected band structures and high mobilities. However, very little is known about thin-film synthesis, which is essential to enable device applications. We synthesize TaAs(001) epilayers by molecular beam epitaxy on GaAs(001) and provide an experimental phase diagram illustrating conditions for single-phase, single-crystal-like growth. We investigate the relationship between nanoscale defects and electronic structure using angle-resolved photoemission spectroscopy, kelvin probe force microscopy, and transmission electron microscopy. Our results provide a roadmap and platform for developing 3D WSMs for device applications.

Original languageEnglish
Pages (from-to)2886-2899
Number of pages14
Issue number9
Publication statusPublished - 6 Sept 2023


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