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There has been great interest in realizing quantum simulators of chargedparticles in artificial gauge fields. Here, we perform the first quantumsimulation explorations of the combination of artificial gauge fields anddisorder. Using synthetic lattice techniques based on parametrically-coupledatomic momentum states, we engineer zigzag chains with a tunable homogeneousflux. The breaking of time-reversal symmetry by the applied flux leads toanalogs of spin-orbit coupling and spin-momentum locking, which we observedirectly through the chiral dynamics of atoms initialized to single latticesites. We additionally introduce precisely controlled disorder in the siteenergy landscape, allowing us to explore the interplay of disorder and largeeffective magnetic fields. The combination of correlated disorder andcontrolled intra- and inter-row tunneling in this system naturally supportsenergy-dependent localization, relating to a single-particle mobility edge. Wemeasure the localization properties of the extremal eigenstates of this system,the ground state and the most-excited state, and demonstrate clear evidence fora flux-dependent mobility edge. These measurements constitute the first directevidence for energy-dependent localization in a lower-dimensional system, aswell as the first explorations of the combined influence of artificial gaugefields and engineered disorder. Moreover, we provide direct evidence forinteraction shifts of the localization transitions for both low- andhigh-energy eigenstates in correlated disorder, relating to the presence of amany-body mobility edge. The unique combination of strong interactions,controlled disorder, and tunable artificial gauge fields present in thissynthetic lattice system should enable myriad explorations into intriguingcorrelated transport phenomena.

Engineering a flux-dependent mobility edge in disordered zigzag chains