Topological phase transition in an all-optical exciton-polariton lattice
Topological phase transition in an all-optical exciton-polariton lattice
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DOI：
10.1364/optica.426996
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发表时间：
2021-02
期刊：
影响因子：
10.4
通讯作者：
M. Pieczarka;E. Estrecho;Sanjib Ghosh;M. Wurdack;M. Steger;D. Snoke;K. West;L. Pfeiffer;T. Liew;A. Truscott;E. Ostrovskaya
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文献类型：
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作者：
M. Pieczarka;E. Estrecho;Sanjib Ghosh;M. Wurdack;M. Steger;D. Snoke;K. West;L. Pfeiffer;T. Liew;A. Truscott;E. Ostrovskaya
拓扑绝缘体是一类电子材料，其表现出对扰动和无序免疫的鲁棒边缘状态。这个概念已经成功地应用于光子学，在那里开发了拓扑非平凡波导和拓扑激光器。然而，在一个给定的光子系统中的拓扑特性的探索是有限的制造的样品，没有灵活性，重新配置的结构在原位。在这里，我们展示了一个全光学实现的轨道Su-Schrieffer-Heeger模型中的微腔激子极化激元系统，其中一个腔光子与激子在GaAs量子阱杂交。我们通过对非共振激光激发的整形，全光学地诱导出激子极化激元的锯齿形势，并直接测量了玻色凝聚非线性区域中极化激元晶格的本征谱和拓扑边缘态.此外，利用光诱导晶格的可调谐性，我们修改了位间隧穿，实现了到平凡态的拓扑相变。我们的研究结果开辟了一条道路，研究拓扑相变的需求，在完全可重构的混合光子系统，不需要复杂的样品工程。
Topological insulators are a class of electronic materials exhibiting robust edge states immune to perturbations and disorder. This concept has been successfully adapted in photonics, where topologically nontrivial waveguides and topological lasers were developed. However, the exploration of topological properties in a given photonic system is limited to a fabricated sample, without the flexibility to reconfigure the structure in situ. Here, we demonstrate an all-optical realization of the orbital Su–Schrieffer–Heeger model in a microcavity exciton-polariton system, whereby a cavity photon is hybridized with an exciton in a GaAs quantum well. We induce a zigzag potential for exciton polaritons all-optically by shaping the nonresonant laser excitation, and measure directly the eigenspectrum and topological edge states of a polariton lattice in a nonlinear regime of bosonic condensation. Furthermore, taking advantage of the tunability of the optically induced lattice, we modify the intersite tunneling to realize a topological phase transition to a trivial state. Our results open the way to study topological phase transitions on-demand in fully reconfigurable hybrid photonic systems that do not require sophisticated sample engineering.