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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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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
Publication: Physical Review B
Publisher: 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: 03 Jun 2008
Last Modified: 19 Sep 2010 04:45
URI: http://eprints.iisc.ac.in/id/eprint/14150

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