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We propose and characterize solid-state photonic structures where light experiences an artificial gauge field. A suitable coupling of the propagation and polarization degrees of freedom introduces a geometrical phase for photons tunneling between adjacent sites of a coupled cavity array. We then discuss the feasibility of observing strong gauge field effects in the optical spectra of realistic systems, including the Hofstadter butterfly spectrum.
Comment: 6 pages including the Supplemental Material (accepted for publication in Phys. Rev. Lett.)
Comment: 5 pages,3 figures. High resolution figures available upon request
Comment: 7 pages, 4 figures, new discussion of effective Hamiltonian, references added
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