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The advantages of light and matter-wave Sagnac interferometers -- large areaon one hand and high rotational sensitivity per unit area on the other -- canbe combined utilizing ultra-slow light in cold atomic gases. While agroup-velocity reduction alone does not affect the Sagnac phase shift, theassociated momentum transfer from light to atoms generates a coherentmatter-wave component which gives rise to a substantially enhanced rotationalsignal. It is shown that matter-wave sensitivity in a large-area interferometercan be achieved if an optically dense vapor at sub-recoil temperatures is used.Already a noticeable enhancement of the Sagnac phase shift is possible howeverwith much less cooling requirements.Comment: 4 pages, 3 figure

Sagnac Interferometry Based on Ultraslow Polaritons in Cold Atomic Vapors