Evidence of decoupling of surface and bulk states in Dirac semimetal Cd 3 As 2

Yu, W.; Rademacher, D. X.; Valdez, N. R.; Rodriguez, M. A.; Nenoff, T. M.; Pan, W.

doi:10.1088/1361-6528/ac7c25

Evidence of decoupling of surface and bulk states in Dirac semimetal Cd ₃ As ₂

Journal Article · Mon Jul 25 00:00:00 EDT 2022 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/ac7c25· OSTI ID:1877779

Yu, W.; Rademacher, D. X.; Valdez, N. R.; Rodriguez, M. A.; Nenoff, T. M.;

Abstract

Dirac semimetals have attracted a great deal of current interests due to their potential applications in topological quantum computing, low-energy electronic devices, and single photon detection in the microwave frequency range. Herein are results from analyzing the low magnetic ( B ) field weak-antilocalization behaviors in a Dirac semimetal Cd ₃ As ₂ thin flake device. At high temperatures, the phase coherence length l _ϕ first increases with decreasing temperature ( T ) and follows a power law dependence of l _ϕ ∝ T ^−0.4 . Below ∼3 K, l _ϕ tends to saturate to a value of ∼180 nm. Another fitting parameter α , which is associated with independent transport channels, displays a logarithmic temperature dependence for T > 3 K, but also tends to saturate below ∼3 K. The saturation value, ∼1.45, is very close to 1.5, indicating three independent electron transport channels, which we interpret as due to decoupling of both the top and bottom surfaces as well as the bulk. This result, to our knowledge, provides first evidence that the surfaces and bulk states can become decoupled in electronic transport in Dirac semimetal Cd ₃ As ₂ .

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Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1877779

Alternate ID(s):: OSTI ID: 1877141

Report Number(s):: SAND2022-8659J

Journal Information:: Nanotechnology, Journal Name: Nanotechnology Journal Issue: 41 Vol. 33; ISSN 0957-4484

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Evidence of decoupling of surface and bulk states in Dirac semimetal Cd ₃ As ₂