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

Summary, in English

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.

• Author: Andrius Jurgilaitis; Henrik Enquist; Pererik Andreasson; Anna Persson; Mattias Borg; P Caroff; Kimberly Dick Thelander; Maher Harb; Heiner Linke; Ralf Nüske; Lars-Erik Wernersson; Jörgen Larsson
• Department/s: MAX IV Laboratory; Atomic Physics; Solid State Physics; Centre for Analysis and Synthesis; Department of Electrical and Information Technology; NanoLund: Centre for Nanoscience
• Publishing year: 2014
• Language: English
• Pages: 541-546
• Publication/Series: Nano Letters
• Volume: 14
• Issue: 2
• Links: http://dx.doi.org/10.1021/nl403596b
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Nano Technology
• Status: Published
• ISBN/ISSN/Other: ISSN: 1530-6992