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D. D. Solnyshkov1, R. Johne, G. Pavlovic1, I.A. Shelykh2,3 , G. Malpuech1 1 LASMEA, CNRS and Universite Blais Pascal, Aubiere, France 2 Science Institute University of Reykjavik, Reykjavik, Iceland 3 St. Petersburg State Polytechnical Unibersity, St. Petersburg, Russia I will begin by presenting the spinor cavity exciton-polaritons (polaritons). I will briefly discuss the main features of the polariton Bose Einstein Condensation. I will then analyze the Josephson-type effects in condensates of spinor polaritons [1]. We distinguish two types of the Josephson effects: extrinsic effect related to the coherent tunneling of the particles with the same spin between two spatially separated potential traps and intrinsic effect related to the tunneling between different spinor components of the condensate within the same trap. The former effect occurs due to an overlap between the condensates in the different wells and the latter because of the anisotropy of the quantum well in the direction of the structure growth axis, which is equivalent to the application of an effective in-plane magnetic field able to provoke spin-flip processes. If the initial imbalance between the occupation numbers of the two coupled condensates exceeds some critical value, the effect of the macroscopic quantum self-trapping occurs [2]. When approaching this critical value, the dynamics changes from harmonic to anharmonic oscillations both in the case of extrinsic and intrinsic effect (Fig. 1b). When the finite life-time of the particles is taken into account, a transition between macroscopic quantum self-trapping and normal oscillations can be achieved. We also show that the Josephson effect in nonlinear regime can lead to nontrivial polarization dynamics and produce spontaneous separation of the condensates with opposite polarization in real space. We show that a system of two traps under cw pumping can exhibit chaotic oscillations, if one takes into account the intrinsic Josephson effect between the two polarizations. This chaotic behavior can be used for cryptographic purposes: by synchronizing two similar systems, one can transmit information with chaotic masking at high bitrates [3]. 1. I. A. Shelykh, D.D. Sholnyshkov, G. Pavlovic and G. Malpuech, Phys. Rev. B 78, 0413302(R) (2008). 2. A. Smerzi et al., Phys. Rev. Lett. 79, 4950 (1997). 3. L.M. Pecora, T.L. Carroll, Phys. Rev. Lett. 64, 821 (1990). |
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