Temperature dependence of the Raman spectrum in Ge${}_{1\ensuremath{-}y}$Sn${}_{y}$ and Ge${}_{1\ensuremath{-}x\ensuremath{-}y}$Si${}_{x}$Sn${}_{y}$ alloys

Temperature dependence of the Raman spectrum in Ge $_{1 - y}$ Sn $_{y}$ and Ge $_{1 - x - y}$ Si $_{x}$ Sn $_{y}$ alloys

Sampriti Bagchi, Christian D. Poweleit, Richard T. Beeler, John Kouvetakis, and José Menéndez

Phys. Rev. B 84, 193201 – Published 2 November 2011

Abstract

The temperature dependence of the Raman spectrum of Ge-rich Ge $_{1 - y}$ Sn $_{y}$ and Ge $_{1 - x - y}$ Si $_{x}$ Sn $_{y}$ alloys has been determined in the 10- to 400-K range. The Raman line shift and width changes as a function of temperature are found to be virtually identical to those observed in bulk Ge. This result shows that the anharmonic decay process responsible for the temperature dependence is extremely robust against the alloy perturbation, so that the expected relaxation of the wave vector conservation rule does not affect the decay in any noticeable way.

Received 5 July 2011

DOI:https://doi.org/10.1103/PhysRevB.84.193201

Authors & Affiliations

Sampriti Bagchi¹, Christian D. Poweleit¹, Richard T. Beeler², John Kouvetakis², and José Menéndez^1,*

¹Department of Physics, Arizona State University, Tempe, Arizona 85287-1504, USA
²Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA

^*Corresponding author: jose.menendez@asu.edu

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Vol. 84, Iss. 19 — 15 November 2011

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Physical Review B

covering condensed matter and materials physics

Temperature dependence of the Raman spectrum in Ge $_{1 - y}$ Sn $_{y}$ and Ge $_{1 - x - y}$ Si $_{x}$ Sn $_{y}$ alloys

Sampriti Bagchi, Christian D. Poweleit, Richard T. Beeler, John Kouvetakis, and José Menéndez

Phys. Rev. B 84, 193201 – Published 2 November 2011

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Physical Review B

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Temperature dependence of the Raman spectrum in Ge1−ySny and Ge1−x−ySixSny alloys

Sampriti Bagchi, Christian D. Poweleit, Richard T. Beeler, John Kouvetakis, and José Menéndez

Phys. Rev. B 84, 193201 – Published 2 November 2011

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Temperature dependence of the Raman spectrum in Ge $_{1 - y}$ Sn $_{y}$ and Ge $_{1 - x - y}$ Si $_{x}$ Sn $_{y}$ alloys