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The polarization dependence of the double resonant Raman scattering (2D) bandin bilayer graphene (BLG) is studied as a function of the excitation laserenergy. It has been known that the complex shape of the 2D band of BLG can bedecomposed into four Lorentzian peaks with different Raman frequency shiftsattributable to four individual scattering paths in the energy-momentum space.From our polarization dependence study, however, we reveal that each of thefour different peaks is actually doubly degenerate in its scattering channels,i.e., two different scattering paths with similar Raman frequency shifts foreach peak. We find theoretically that one of these two paths, ignored for along time, has a small contribution to their scattering intensities but arecritical in understanding their polarization dependences. Because of this, themaximum-to-minimum intensity ratios of the four peaks show a strong dependenceon the excitation energy, unlike the case of single-layer graphene (SLG). Ourfindings thus reveal another interesting aspect of electron-phonon interactionsin graphitic systems.

Polarization dependence of double resonant Raman scattering band in bilayer graphene