Burkov, A. A.Lukin, MikhailDemler, Eugene2016-08-242007Burkov, A. A., M. D. Lukin, and Eugene Demler. 2007. “Decoherence Dynamics in Low-Dimensional Cold Atom Interferometers.” Physical Review Letters 98 (20) (May 17). doi:10.1103/physrevlett.98.200404.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:27891678We report on a study of the dynamics of decoherence of a matter-wave interferometer, consisting of a pair of low-dimensional cold atom condensates at finite temperature. We identify two distinct regimes in the time dependence of the coherence factor of the interferometer: quantum and classical. Explicit analytical results are obtained in both regimes. In particular, in the two-dimensional case in the classical (long time) regime, we find that the dynamics of decoherence is universal, exhibiting a power-law decay with an exponent, proportional to the ratio of the temperature to the Kosterlitz-Thouless temperature of a single 2D condensate. In the one-dimensional case in the classical regime we find a universal nonanalytic time dependence of decoherence, which is a consequence of the nonhydrodynamic nature of damping in 1D liquids.en-USJournal Article2016-08-2410.1103/PhysRevLett.98.200404