Photonic band gap in the triangular lattice of Bose-Einstein-condensate vortices

Received 26 March 2007; published 27 June 2007We investigate the photonic bands of an atomic Bose-Einstein condensate with a triangular vortex lattice.Index contrast between the vortex cores and the bulk of the condensate is achieved through the enhancementof the index via atomic coherence. The frequency-dependent dielectric function is used in the calculations ofthe bands, resulting in photonic band gap widths of a few megahertz.DOI: 10.1103/PhysRevA.75.063627 PACS number s : 03.75.Lm, 42.50.Gy, 42.70.Qs, 74.25.Qt