Thin-Film TaAs: Developing a Platform for Weyl Semimetal Devices

Jocienne Nelson, Anthony Rice, Rafal Kurleto, Amanda Shackelford, Zachary Sierzega, Peipei Hao, Bryan Berggren, Chun-Sheng Jiang, Andrew Norman, Megan Holtz, John Mangum, Ian Leahy, Karen Heinselman, Herve Ness, Mark van Schilfgaarde, Daniel Dessau, Kirstin Alberi

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations

Abstract

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 languageAmerican English
Pages (from-to)2886-2899
Number of pages14
JournalMatter
Volume6
Issue number9
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Inc.

NREL Publication Number

  • NREL/JA-5K00-85458

Keywords

  • angle-resolved photoemission spectroscopy
  • defects
  • disorder
  • interfaces
  • magnetotransport
  • MAP3: Understanding
  • molecular beam epitaxy
  • scanning probe microscopy
  • synthesis
  • thin film
  • topological semimetal

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