This article is cited in 20 papers

Low dimensional systems

Optical phonons in the bulk and on the surface of ZnO and ZnTe/ZnO nanowires in Raman spectra

V. S. Vinogradov^a, V. N. Dzhagan^b, T. N. Zavaritskaya^a, I. V. Kucherenko^a, N. N. Mel'nik^a, N. N. Novikova^c, E. Janik^d, T. Wojtowicz^d, O. S. Plyashechnik^a, D. R. T. Zahn<sup>e

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^b Institute of Semiconductor Physics NAS, Kiev
^c Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
^d Institute of Physics, Polish Academy of Sciences, Warsaw, 02-668, Poland
^e Semiconductor Physics, Chemnitz University of Technology, Chemnitz, Germany

Abstract: Raman spectra of ZnO and core-shell ZnTe/ZnO nanowires have been measured under conditions of nonresonant and resonant excitations by Ar$^+$ and He–Cd lasers. The optical vibration frequencies that are characteristic of the wurtzite structure of ZnO crystals have been determined. The Raman-active longitudinal optical (LO) phonons in all the studied structures have a mixed $A_1$ and $E_1$ symmetry. Surface optical modes with frequencies of 460–470 cm$^{-1}$ have been found. Surface optical modes of single-layer nanowires have been analyzed using the calculation performed in the previous work by P.M. Chassaing and his colleagues, and those of double-layer nanowires have been analyzed in terms of the expressions obtained in the present work. The size of heterogeneities of the nanowires along their axis has been determined.

Received: 05.03.2012

 English version: Physics of the Solid State, 2012, 54:10, 2083–2090

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