Vibrational modes and crystallographic structure of Cd3As2 and (Cd1-xZnx)3As2 epilayers

Fluegel, Brian; Rice, Anthony D.; Alberi, Kirstin

doi:10.1088/1361-6463/ac43db

Title: Vibrational modes and crystallographic structure of Cd₃As₂ and (Cd_1-xZn_x)₃As₂ epilayers

Journal Article · 09 January 2022 · Journal of Physics. D, Applied Physics

DOI: https://doi.org/10.1088/1361-6463/ac43db · OSTI ID:1845671

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National Renewable Energy Lab. (NREL), Golden, CO (United States)

Low-temperature Raman scattering is used to study the crystal structure of molecular-beam epitaxially grown layers of the Dirac semimetal Cd₃As₂ and its related alloy (Cd_1-xZn_x)₃As₂. The combination of narrow-linewidth spectra, multiple growth directions and full polarization analysis allows improved accuracy in identifying the irreducible representation of over 57 Raman-active vibrations. Several disagreements with previous identifications are found. Structurally, the results agree with the centrosymmetric I41/acd space group of bulk-grown Cd₃As₂ and are clearly distinct from the Raman spectra of nanoscale platelets and wires. Three-fold twinning is seen in (112) Cd₃As₂ grown on (111) zincblende substrates corresponding to the three possible tetragonal orientations. In dilute (Cd_1-xZn_x)₃As₂, phonons have a frequency and scattering amplitude dependence on Zn concentration that is continuous with Cd₃As₂ but at least one frequency is absent at the alloy endpoint, preventing a simple one-mode description of the alloy phonon.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1845671

Report Number(s):: NREL/JA-5K00-81303; MainId:82076; UUID:e474fb13-4772-4179-935b-764e3e3aaeef; MainAdminID:63305

Journal Information:: Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 14 Vol. 55; ISSN 0022-3727

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
crystal structure
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Title: Vibrational modes and crystallographic structure of Cd3As2 and (Cd1-xZnx)3As2 epilayers

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References (26)

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Title: Vibrational modes and crystallographic structure of Cd₃As₂ and (Cd_1-xZn_x)₃As₂ epilayers