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We demonstrate atomic four-wave mixing of two-component matter waves in acollinear geometry. Starting from a single-species Bose-Einstein condensate,seed and pump modes are prepared through microwave state transfer andstate-selective Kapitza-Dirac diffraction. Four-wave mixing then populates theinitially empty output modes. Simulations based on a coupled-mode expansion ofthe Gross-Pitaevskii equation are in very good agreement with the experimentaldata. We show that four-wave mixing can play an important role in studies ofbosonic mixtures in optical lattices. Moreover our system should be of interestin the context of quantum atom optics.

Collinear Four-Wave Mixing of Two-Component Matter Waves