Theory of Graphene Raman Spectroscopy

摘要: Raman spectroscopy plays a key role in studies of graphene and related carbon systems. Graphene is perhaps the most promising material recent times for many novel applications, including electronics. In this paper, traditional well established Kramers-Heisenberg-Dirac (KHD) scattering theory (1925-1927) extended to crystalline first time. It demands different phonon production mechanisms energies than does popular "double resonance" model. The latter has never been compared KHD. Within KHD, phonons are produced instantly along with electrons holes, what we term an electron-hole-phonon triplet, which not suffer Pauli blocking. A new mechanism double name "transition sliding" explains brightness 2D mode other overtones, as result linear (Dirac cone) electron dispersion. Direct evidence sliding resides hole doping experiments performed 2011 \cite{chenCrommie}. Whole ranges electronic transitions permitted may even constructively interfere same laser energy q, explaining dispersion, bandwidth, strength two bands. Graphene's entire spectrum, dispersive fixed bands, missing bands forbidden by symmetries, weak overtone Stokes anti-Stokes anomalies, individual bandwidths, trends doping, D-2D band spacing anomalies emerge naturally directly KHD theory.