SCL Seminar by Denis V. Makarov

SCL seminar of the Center for the Study of Complex Systems, will be held on Friday, 11 August 2017 at 14:00 in the library reading room “Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

"Nonlinear dynamics of coherently-coupled two-species Bose-Einstein condensates"

will be given by Denis V. Makarov (V. I. Il'ichev Pacific Oceanological Institute of the Far-Eastern Branch of the Russian Academy of Sciences, Vladivostok, Russia).

Abstract of the talk:

Two-component Bose-Einstein condensates with linear inter-component coupling have become an object of considerable interest because of their nontrivial dynamical properties. In this talk we will address the dynamics of a two-species Bose-Einstein condensate where the two species correspond to different hyperfine states of the same type of atoms. External microwave radiation leads to resonant transitions between the states. The condensate is loaded into the optical lattice. We will focus our attention on the interplay of spatial and internal dynamics of the mixture [1, 2].

We will show that the enhancement of atomic interactions results in demixing of the condensates and leads to the formation of immiscible solitons, i.e. solitons consisting of only one of the atomic species. This process is preceded by a transient regime with highly irregular behavior of the mixture. We will demonstrate that the transient regime can be associated with dynamical chaos, and that the soliton formation is an unpredictable process, i.e. one cannot exactly predict neither the spatial location of solitons, nor the species they consist of. In addition, our calculations suggest a possibility of spontaneous synchronization of Rabi oscillations on neighboring lattice sites. On average, number of synchronized sites increases with time.

[1] M. Y. Uleysky, D. V. Makarov, Journal of Russian Laser Research 35, 138 (2014)
[2] D. V. Makarov, M. Y. Uleysky, Communications in Nonlinear Science and Numerical Simulation 43, 227 (2017)