Phonons in few-layer graphene and interplanar interaction: A first-principles study

Saha, Srijan Kumar and Waghmare, UV and Krishnamurthy, HR and Sood, AK (2008) Phonons in few-layer graphene and interplanar interaction: A first-principles study. In: Physical Review B: Condensed Matter and Materials Physics, 78 (16). pp. 165421-165426.

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Abstract

We use first-principles density-functional theory calculations to determine the vibrational properties of ultrathin n(1,2,…,7) -layer graphene films and present a detailed analysis of their zone-center phonons. We demonstrate that a low-frequency (˜112cm‑1) optical phonon with out-of-plane displacements exhibits a particularly large sensitivity to the number of layers, although no discernible change in the interlayer spacing is found as n varies. Frequency shifts of the optical phonons in bilayer graphene are also calculated as a function of its interlayer separation and interpreted in terms of the interplanar interaction.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Sep 2009 08:59
Last Modified:	19 Sep 2010 04:57
URI:	http://eprints.iisc.ac.in/id/eprint/17525

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