Reference : Vibrational properties of boron nitride nanotubes: Effects of finite length and bundling

	Document type :	Scientific congresses, symposiums and conference proceedings : Paper published in a journal
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/17598

Title :	Vibrational properties of boron nitride nanotubes: Effects of finite length and bundling
Language :	English
Author, co-author :	Wirtz, Ludger [Univ. del Pais Vasco (Spain) and Donostia Internaitonal Physics Ctr. (Spain)]
	Rubio, A. [Univ. del Pais Vasco (Spain) and Donostia Internaitonal Physics Ctr. (Spain)]
Publication date :	2003
Journal title :	IEEE Transactions on Nanotechnology
Volume :	2
Special issue title :	NANOTECHNOLOGY
Pages :	341
Peer reviewed :	Yes
On invitation :	Yes
Audience :	International
ISSN :	1536-125X
Event name :	Conference on Nanotechnology
Event date :	19-21 May 2003
Abstract :	[en] We present ab initio calculations of phonons in single-wall. boron nitride nanotubes. Raman and infrared active modes of isolated and infinitely long tubes are evaluated according to the non-symmorphic rod groups of BN nanotubes. For tubes of finite length, the selection rules are less restrictive and give rise to additional modes which may be observed in Raman and IR spectroscopy with an intensity depending on the tube length. Bundling of tubes is shown to have little effect on the phonon frequencies. However, arranging tubes in a large periodic array (larger than the wave-length of incoming light) gives rise to a strong frequency shift (LO-TO splitting) of some modes due to the establishing of a macroscopic electric field. Modes of A(1) symmetry experience a shift for laser light along the tube axis and E-1 modes are split for light incidence in the perpendicular direction.
Permalink :	http://hdl.handle.net/10993/17598
DOI :	10.1109/TNANO.2003.820511
Commentary :	0-8194-4978-4 MAY 19-21, 2003 Conference on Nanotechnology Maspalomas Spain Vajtai, R Aymerich, X Kish, LB Rubio, A SPIE, Spanish Govt, Canary Govt, Canary Isl Special Zone, Res Inst Appl Microelect, Univ Las Palmas Gran Canaria, Sch Telecommun Engn, Univ Las Palmas Gran Canaria, Dept Elect Engn & Control

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