We study the spectral function Ak(ω) and the optical conductivity σ1(ω) for a system of fermions interacting with their collective spin fluctuations (the spin-fermion model), and apply the results to optimally doped cuprates in the normal state. We show that there is no qualitative distinction between hot and cold regions in the Brillouin zone-in both cases, there exists a wide range of frequencies where the width of the peak in Ak(ω) scales linearly with ω. We demonstrate that σ1(ω) is inversely linear in ω up to very high frequencies. We argue that the slopes of Ak(ω) and σ1(ω) agree quantitatively with the photoemission and optical data for Bi2212.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2001|