Doped graphene as tunable electron-phonon coupling material

Claudio Attaccalite , L. Wirtz (1) , M. Lazzeri , Francesco Mauri , A. Rubio

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520

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 electronelectron 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 electronic devices through the external control of the EPC

Domaines: Sciences de l'ingénieur [physics]

Claudio Attaccalite, L. Wirtz, M. Lazzeri, Francesco Mauri, A. Rubio. Doped graphene as tunable electron-phonon coupling material. Nano Letters, 2010, 10 (4), pp.1172-1176. ⟨10.1021/nl9034626⟩. ⟨hal-00549056⟩