Exact solution of the dynamic pseudogap model: Fock-space formalism for Gaussian fluctuations

Abstract

We present an exact solution of the dynamic finite-$Q$ pseudogap model, in which electrons scatter between two nested Fermi-surface patches off a classical Gaussian order-parameter field with characteristic frequency $ω_0$ and damping $γ$. The disorder-averaged Green's function is shown to be a single matrix element of the resolvent of a sparse non-Hermitian matrix acting on a Fock space of two (commensurate fluctuations) or four (incommensurate fluctuations) bosonic modes with complex energies. The non-commutativity of the pseudospin vertices at different times, which prevented an exact treatment so far, is retained in full. We derive the representation, its symmetries, and the exact limits it contains: the static continued fractions, the closed-form commensurate solution at the Fermi surface, and the second-order self-energy. A numerically exact implementation gives spectral functions and densities of states for all values of the fluctuation frequency, damping and electron energy. We find that the sideband comb of the spectral function stays close to multiples of $ω_0$ and that quasiparticle damping is governed by an energy-dependent decoherence rate. At resonance of a quasiparticle energy with $ω_0/2$, we obtain the static fuctuating-gap in a rotating frame, which leads to resonant splitting of the quasiparticle peak.