Physics Seminar
  • FENS
  • Physics Seminar

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Spinoptronics with polaritonic devices: Spin multistability in dissipative polariton wires

Cavity polaritons are composite particles arising from strong coupling between the photonic mode of microcavity and the exciton transition in a semiconductor quantum well. Extremely low effective masses due to their hybrid half-light-half-matter nature with strong polariton-polariton interactions make the system an ideal candidate for the observation of the variety of quantum collective phenomena at surprisingly high temperatures. Bose-Einstein condensation, superfluidity, the Josephson effect, and topological excitations are among these phenomena which are confirmed experimentally. Also, peculiar spin structure of polaritons opens  a way for the creation of optical analogs of spintronic components (so called spinoptronic devices). With respect to optics, spinoptronics has the advantage of being able to use particle-particle interactions occurring in nanostructures and resulting in strong nonlinearities. With respect to spintronics, it has the advantage of strongly reducing spin relaxation, and decoherence, which severely limits the functionality of semiconductor-based spintronic devices.  

In this talk,  a special emphasis will be given to a multistability effect which can be used as a base for memory elements and logic gates. Theoretical model will be presented for the description of the dynamics of a system of spinor cavity polaritons in real space and time, accounting for all relevant types of the interactions and effective magnetic fields. This general formalism will be applied for the consideration of the polarization dynamics of the coherently driven, one-dimensional polariton channel. The effect of the temperature, the longitudinal-transverse splitting, and the phase of the driving laser pump on the spin multistability will be investigated. It will be shown that the multistability behavior can survive up to high temperatures in the presence of longitudinal-transverse splitting.