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Atom interferometry using stimulated Raman transitions in a retroreflectedconfiguration is the first choice in high precision measurements because itprovides low phase noise, high quality Raman wavefront and simple experimentalsetup. However, it cannot be used for atoms at zero velocity because two pairsof Raman lasers are simultaneously resonant. Here we report a method whichallows to lift this degeneracy by using a frequency chirp on the Raman lasers.Using this technique, we realize a Mach-Zehnder atom interferometer hybridizedwith a force balanced accelerometer which provides horizontal accelerationmeasurements with a short-term sensitivity of $3.2\times 10^{-5}$m.s$^{-2}$/$\sqrt{Hz}$. We check at the level of precision of our experimentthe absence of bias induced by this method. This technique could be used formultiaxis inertial sensors, tiltmeters or atom interferometry in a microgravityenvironment.

Zero-velocity atom interferometry using a retroreflected frequency chirped laser