Raman Scattering Study of Lattice Vibrations in the Type-II Superlattice InAs/InAs1-xSbx

Henan Liu, Yong Zhang, Elizabeth H. Steenbergen, Shi Liu, Zhiyuan Lin, Yong-Hang Zhang, Jeomoh Kim, Mi Hee Ji, Theeradetch Detchprohm, Russell D. Dupuis, Jin K. Kim, Samuel D. Hawkins, John F. Klem

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Abstract

The InAs/InAs1-xSbx superlattice system distinctly differs from two well-studied superlattice systems GaAs/AlAs and InAs/GaSb in terms of electronic band alignment, common elements at the interface, and phonon spectrum overlapping of the constituents. This fact leads to the unique electronic and vibrational properties of the InAs/InAs1-xSbx system when compared to the other two systems. In this work, we report a polarized Raman study of the vibrational properties of the InAs/InAs1-xSbx superlattices (SLs) as well as selected InAs1-xSbx alloys, all grown on GaSb substrates by either MBE or metalorganic chemical vapor deposition (MOCVD) from both the growth surface and cleaved edge. In the SL, from the (001) backscattering geometry, an InAs-like longitudinal optical (LO) mode is observed as the primary feature, and its intensity is found to increase with increasing Sb composition. From the (110) cleaved-edge backscattering geometry, an InAs-like transverse optical (TO) mode is observed as the main feature in two cross-polarization configurations, but an additional InAs-like "forbidden" LO mode is observed in two parallel-polarization configurations. The InAs1-xSbx alloys lattice matched to the substrate (xSb∼0.09) grown by MBE are also found to exhibit the forbidden LO mode, implying the existence of some unexpected [001] modulation. However, the strained samples (xSb∼0.35) grown by MOCVD are found to behave like a disordered alloy. The primary conclusions are (1) the InAs-like LO or TO mode can be either a confined or quasiconfined mode in the InAs layers of the SL or extended mode of the whole structure depending on the Sb composition. (2) InAs/InAs1-xSbx and InAs/GaSb SLs exhibit significantly different behaviors in the cleaved-edge geometry but qualitatively similar in the (001) geometry. (3) The appearance of the forbidden LO-like mode is a universal signature for SLs and bulk systems resulting from the mixing of phonon modes due to structural modulation or symmetry reduction.

Original languageEnglish (US)
Article number034028
JournalPhysical Review Applied
Volume8
Issue number3
DOIs
StatePublished - Sep 26 2017

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lattice vibrations
Raman spectra
geometry
metalorganic chemical vapor deposition
backscattering
modulation
cross polarization
configurations
electronics
superlattices
alignment
signatures
symmetry
polarization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Raman Scattering Study of Lattice Vibrations in the Type-II Superlattice InAs/InAs1-xSbx. / Liu, Henan; Zhang, Yong; Steenbergen, Elizabeth H.; Liu, Shi; Lin, Zhiyuan; Zhang, Yong-Hang; Kim, Jeomoh; Ji, Mi Hee; Detchprohm, Theeradetch; Dupuis, Russell D.; Kim, Jin K.; Hawkins, Samuel D.; Klem, John F.

In: Physical Review Applied, Vol. 8, No. 3, 034028, 26.09.2017.

Research output: Contribution to journalArticle

Liu, H, Zhang, Y, Steenbergen, EH, Liu, S, Lin, Z, Zhang, Y-H, Kim, J, Ji, MH, Detchprohm, T, Dupuis, RD, Kim, JK, Hawkins, SD & Klem, JF 2017, 'Raman Scattering Study of Lattice Vibrations in the Type-II Superlattice InAs/InAs1-xSbx', Physical Review Applied, vol. 8, no. 3, 034028. https://doi.org/10.1103/PhysRevApplied.8.034028
Liu, Henan ; Zhang, Yong ; Steenbergen, Elizabeth H. ; Liu, Shi ; Lin, Zhiyuan ; Zhang, Yong-Hang ; Kim, Jeomoh ; Ji, Mi Hee ; Detchprohm, Theeradetch ; Dupuis, Russell D. ; Kim, Jin K. ; Hawkins, Samuel D. ; Klem, John F. / Raman Scattering Study of Lattice Vibrations in the Type-II Superlattice InAs/InAs1-xSbx. In: Physical Review Applied. 2017 ; Vol. 8, No. 3.
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AU - Liu, Shi

AU - Lin, Zhiyuan

AU - Zhang, Yong-Hang

AU - Kim, Jeomoh

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AU - Detchprohm, Theeradetch

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