  We numerically study the zero temperature phase structure of the multiflavor
Schwinger model at nonzero chemical potential. Using matrix product states, we
reproduce analytical results for the phase structure for two flavors in the
massless case and extend the computation to the massive case, where no
analytical predictions are available. Our calculations allow us to locate phase
transitions in the mass-chemical potential plane with great precision and
provide a concrete example of tensor networks overcoming the sign problem in a
lattice gauge theory calculation.
