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Long-wavelength, confined optical phonons in InAs nanowires probed by Raman spectroscopy

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Abstract.

Strongly confined nano-systems, such as one-dimensional nanowires, feature deviations in their structural, electronic and optical properties from the corresponding bulk. In this work, we investigate the behavior of long-wavelength, optical phonons in vertical arrays of InAs nanowires by Raman spectroscopy. We attribute the main changes in the spectral features to thermal anharmonicity, due to temperature effects, and rule out the contribution of quantum confinement and Fano resonances. We also observe the appearance of surface optical modes, whose details allow for a quantitative, independent estimation of the nanowire diameter. The results shed light onto the mechanisms of lineshape change in low-dimensional InAs nanostructures, and are useful to help tailoring their electronic and vibrational properties for novel functionalities.

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Authors and Affiliations

  1. IMEC, Kapeldreef 75, 3001, Leuven, Belgium

    M. Cantoro, A. V. Klekachev, A. Nourbakhsh, B. Sorée, M. M. Heyns & S. De Gendt

  2. Department of Physics and Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200d, 3001, Leuven, Belgium

    M. Cantoro & A. V. Klekachev

  3. Department of Microbial and Molecular Systems, Katholieke Universiteit Leuven, Kasteelpark Arenberg 23, 3001, Leuven, Belgium

    A. Nourbakhsh

  4. Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, 3001, Leuven, Belgium

    M. M. Heyns

  5. Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200f, 3001, Leuven, Belgium

    S. De Gendt

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  1. M. Cantoro
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  2. A. V. Klekachev
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  3. A. Nourbakhsh
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  4. B. Sorée
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  6. S. De Gendt
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Correspondence to M. Cantoro.

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Cantoro, M., Klekachev, A., Nourbakhsh, A. et al. Long-wavelength, confined optical phonons in InAs nanowires probed by Raman spectroscopy. Eur. Phys. J. B 79, 423–428 (2011). https://doi.org/10.1140/epjb/e2011-10705-2

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  • DOI: https://doi.org/10.1140/epjb/e2011-10705-2

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