  We predict a generic mechanism of wave localization at an interface between
uniform gauge fields, arising due to propagation-dependent phase accumulation
similar to Aharonov-Bohm phenomenon. We realize experimentally a photonic mesh
lattice with real-time control over the vector gauge field, and observe robust
localization under a broad variation of gauge strength and direction, as well
as structural lattice parameters. This suggests new possibilities for confining
and guiding waves in diverse physical systems through the synthetic gauge
fields.
