Nonlinear phenomena in polariton topological insulators

报告题目： Nonlinear phenomena in polariton topological insulators

报告人：Prof. Yaroslav Kartashov

主持人：黄国翔  教授

时间：11月21日（周三）下午3:30

地点：理科大楼A814会议室

主办单位：精密光谱科学与技术国家重点实验室

报告摘要：

In this presentation I will address unique system allowing investigation of the interplay between nonlinearity and topology - polariton condensates in optical microcavities. Optical microcavities supporting exciton-polariton quasi-particles offer one of the most powerful platforms for the investigation of rapidly developing area of topological photonics in general, and of photonic topological insulators in particular. Energy bands of polaritons in arrays of microcavity pillars arranged into various lattice configurations, such as honeycomb or Lieb, are readily controlled by the magnetic field and strongly influenced by the spin-orbit coupling effects, a combination leading to formation of unidirectional edge states in polariton topological insulators. In this presentation I will depart from the linear limit of non-interacting polaritons and address properties of nonlinear topological edge states, describe their instabilities resulting in the formation of localized topological quasi-solitons, which are exceptionally robust and immune to backscattering wavepackets propagating along the edge of the array of microcavity pillars. Both bright and dark topological quasi-solitons will be considered. I will also discuss bistability effects appearing in resonantly pumped polariton condensates in dissipative structured microcavities and describe how polarization and frequency of the pump beam may be used to control stability and localization of the excited nonlinear edge states that can be completely stable in such nonlinear driven systems. Finally, a variety of resonant phenomena with topological edge states that can be induced by temporal modulations of the underlying lattice of microcavity pillars will be discussed.

报告人简介：

Kartashov研究员是俄罗斯科学院光谱学研究所的首席研究员。他于2002年获莫斯科州立大学物理学博士；2002-2004年在西班牙加泰罗尼亚理工大学做博后；2004-2011年在西班牙巴塞罗那科学与技术研究所（ICFO）担任研究助理；2011-2013任俄罗斯科学院光谱学研究所高级研究员、ICFO访问教授；2013年至今任俄罗斯科学院光谱学研究所首席研究员、ICFO访问教授。

       Kartashov 研究员在孤子理论及其应用、玻色-爱因斯坦凝聚、非线性光学等领域做出了许多重要的贡献，在许多国际著名学术刊物上，包括Rev. Mod. Phys、Phy. Rev. Lett、Laser & Photonics Review、Optica等，发表了近百篇学术论文，成果斐然。