Dual-color magic-wavelength trap for suppression of light shifts in atoms

``Magic wavelength'' traps are used in state-of-the-art optical atomic lattice clocks, to hold atoms without perturbing their delicate internal states. Such traps have only been possible for specific atomic species, or have required trapping light that is difficult to produce. This work reveals that, by augmenting a standard optical trap with a weak additional light field of a different color, it is possible to achieve the ``magic'' configuration through the interaction of the two light sources. This opens the field of optical control and precision measurement to a much wider range of atoms, and thus could extend cold-atom sources to a much wider range of applications.