Saha, Srijan Kumar ; Waghmare, U. V. ; Krishnamurthy, H. R. ; Sood, A. K. (2007) Probing zone-boundary optical phonons in doped graphene Physical Review B, 76 (20). 201404_1-201404_4. ISSN 0163-1829
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.76.201404
Related URL: http://dx.doi.org/10.1103/PhysRevB.76.201404
Abstract
We use first-principles density-functional theory to determine the adiabatic frequency shift of the A1'-K and E'-K phonons in a monolayer graphene as a function of both electron and hole doping. Compared to the results for the E2g-Γ phonon (Raman G band), the results for the A1'-K phonon are dramatically different, while those for the E'-K phonon are not so different. Furthermore, we calculate the frequency shifts, as a function of the charge doping of the (K+ΔK) phonons responsible for the Raman 2D band-a key fingerprint of graphene, where ΔK is determined by the double-resonance Raman process.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 17697 |
| Deposited On: | 16 Nov 2010 12:50 |
| Last Modified: | 04 Jun 2011 08:34 |
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