Doped graphene as tunable electron-phonon coupling material

Nano Letters 10, 1172 - 1176 (2010)

Doped graphene as tunable electron-phonon coupling material

C. Attaccalite, L. Wirtz, M. Lazzeri, F. Mauri, A. Rubio

We present a new way to tune the electron-phonon coupling (EPC) in graphene by changing the deformation potential with electron/hole doping. We show the EPC for highest optical branch at the high symmetry point K, acquires a strong dependency on the doping level due to electron-electron correlation not accounted in mean-field approaches.Such a dependency influences the dispersion (with respect to the laser energy) of the Raman D and 2D lines and the splitting of the 2D peak in multi-layer graphene. Finally this doping dependence opens the possibility to construct tunable electron devices through the external control of the EPC.

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Doi
http://dx.doi.org/10.1021/nl9034626
arxiv
http://arxiv.org/abs/1003.0995

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