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.
full.pdf - Published Version
Restricted to Registered users only
Download (297Kb) | Request a copy
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|
|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|
Actions (login required)