Rev. A 88, 033830 (2013). I. B. Mekhov and H. Ritsch, Phys. Rev. Lett. 102, 020403 (2009). J. F. Corney and G. J. Milburn, Phys. Rev. A 58, 2399 (1998). I. D. Leroux, M. H. Schleier-Smith, and V. Vuletić, Phys. Rev. Lett. 104, 073602 (2010).
Also the BEC will lead to an effective change of the cavity length and lattice constant, which should renormalize the wavelength and thus om_recoil.