  We present a functional renormalization group analysis of a quantum critical
point in two-dimensional metals involving Fermi surface reconstruction due to
the onset of spin-density wave order. Its critical theory is controlled by a
fixed point in which the order parameter and fermionic quasiparticles are
strongly coupled and acquire spectral functions with a common dynamic critical
exponent. We obtain results for critical exponents and for the variation in the
quasiparticle spectral weight around the Fermi surface. Our analysis is
implemented on a two-band variant of the spin-fermion model which will allow
comparison with sign-problem-free quantum Monte Carlo simulations.
