Origin of pseudogap behavior in electron doped cuprates

We analyze pseudogap behavior due to thermal magnetic fluctuations in a metal near a spin density wave (SDW) instability. We sum up an infinite series of diagrams, for both the fermionic self-energy and either the SDW order parameter in the SDW state or the magnetic correlation length in the paramagnetic state, to calculate the spectral function in the t-t' Hubbard model on a square lattice at negative doping. We then analyze the behavior of the spectral function A(k,ω) both in the presence and absence of magnetic order for different momentum cuts along the Brillouin zone. Doing so, we find that pseudogap behavior shows up as a two peak structure in EDC (A(k,ω) as a function of ω at a fixed k) but not in MDC (A(k,ω) as a function of k at a fixed ω). We argue that this discrepancy between EDCs and MDCs provides the way to distinguish our precursor scenario from other scenarios of pseudogap behavior. We compare our theory with the existing ARPES data.