Probing zone-boundary optical phonons in doped graphene

Saha, Srijan Kumar and Waghmare, UV and Krishnamurthy, HR and Sood, AK (2007) Probing zone-boundary optical phonons in doped graphene. In: Physical Review B, 76 (20). pp. 201404-1.

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Abstract

We use first-principles density-functional theory to determine the adiabatic frequency shift of the $A^{\prime}_1-K$ and $E^{\prime}-K$ phonons in a monolayer graphene as a function of both electron and hole doping. Compared to the results for the $E_{2g}-\Gamma$ phonon (Raman G band), the results for the $A^{\prime}_1-K$ phonon are dramatically different, while those for the $E^{\prime}-K$ phonon are not so different. Furthermore, we calculate the frequency shifts, as a function of the charge doping of the $(K+\Delta K)$ phonons responsible for the Raman 2D band—a key fingerprint of graphene, where \vert \Delta K \vert is determined by the double-resonance Raman process.

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:	03 Jun 2008
Last Modified:	19 Sep 2010 04:45
URI:	http://eprints.iisc.ernet.in/id/eprint/14150

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