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Terahertz conductivity of the highly mismatched amorphous alloy, GaNBi

Vaisakh, C.P.; Foxon, C.T.; Novikov, Sergei V.; Kini, R.N.

Authors

C.P. Vaisakh

C.T. Foxon

Sergei V. Novikov

R.N. Kini



Abstract

We report terahertz optical conductivity measurements of the highly mismatched alloy, GaNBi. We find that in these amorphous GaNBi epilayers grown using plasma assisted molecular beam epitaxy, the optical conductivity is enhanced in the samples grown at higher gallium beam equivalent pressure (BEP). The optical conductivity spectra in these pseudo-amorphous epilayers follow a Drude–Smith behaviour due to charge confinement effects. The direct current conductivity in the epilayers grown at the highest Ga BEP (3.1 × 10−7 Torr) show an increase of three orders of magnitude compared to the one grown at the lowest Ga BEP (2.0 × 10−7 Torr). Our measurements suggests a percolative transition from an insulating nature in the GaNBi epilayers grown at low Ga BEP to a highly conducting phase in the epilayers grown at high Ga BEP.

Journal Article Type Article
Publication Date Oct 31, 2017
Journal Semiconductor Science and Technology
Print ISSN 0268-1242
Electronic ISSN 1361-6641
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 32
Issue 12
Article Number 125009
APA6 Citation Vaisakh, C., Foxon, C., Novikov, S. V., & Kini, R. (2017). Terahertz conductivity of the highly mismatched amorphous alloy, GaNBi. Semiconductor Science and Technology, 32(12), doi:10.1088/1361-6641/aa9288
DOI https://doi.org/10.1088/1361-6641/aa9288
Keywords Dilute bismides; Terahertz spectroscopy; Percolation conductivity
Publisher URL https://doi.org/10.1088/1361-6641/aa9288
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is an author-created, un-copyedited version of an article accepted for publication in Semiconductor Science and Technology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6641/aa9288

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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