Signatures of Fermi Surface Reconstruction in Raman Spectra of Underdoped Cuprates

Applying a phenomenological model of the pseudogap state, due to Yang, Rice and Zhang [1], we have calculated the Raman B$_{1g}$ and B$_{2g}$ spectra as a function of temperature, as well as doping, for the underdoped cuprates. Motivated by recent angle-resolved photoemission experiments (ARPES) [2], we discuss changes in intensity and peak position brought about by the presence of a pseudogap and the implied Fermi surface reconstruction which are elements of this model. Our calculations capture the main qualitative features revealed in the extensive data set on HgBa$_2$CuO$_{4+\delta}$.\\[4pt] [1] K.Y Yang, T.M. Rice and F.-C. Zhang, PRB 73 17541 (2006).\\[0pt] [2] Kondo et al. Nature 457, 296 (2009).