Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires | Zendy

A. Jurgilaitis | Zendy; H. Enquist | Zendy; B. P. Andreasson | Zendy; Ann Persson | Zendy; Mattias Borg | Zendy; Philippe Caroff | Zendy; Kimberly A. Dick | Zendy; Maher Harb | Zendy; Heiner Linke | Zendy; R. Nüske | Zendy; LarsErik Wernersson | Zendy; Jörgen Larsson | Zendy

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Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires

Author(s) -

A. Jurgilaitis,

H. Enquist,

B. P. Andreasson,

Ann Persson,

Mattias Borg,

Philippe Caroff,

Kimberly A. Dick,

Maher Harb,

Heiner Linke,

R. Nüske,

LarsErik Wernersson,

Jörgen Larsson

Publication year - 2014

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/nl403596b

Subject(s) - phonon , nanowire , diffraction , materials science , dispersion (optics) , condensed matter physics , thermal conductivity , conductivity , speed of sound , optics , optoelectronics , composite material , physics , chemistry , thermodynamics

The modified phonon dispersion is of importance for understanding the origin of the reduced heat conductivity in nanowires. We have measured the phonon dispersion for 50 nm diameter InSb (111) nanowires using time-resolved X-ray diffraction. By comparing the sound speed of the bulk (3880 m/s) and that of a classical thin rod (3600 m/s) to our measurement (2880 m/s), we conclude that the origin of the reduced sound speed and thereby to the reduced heat conductivity is that the C44 elastic constant is reduced by 35% compared to the bulk material.

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