报告题目（Title）：Topological phases of quantized light

报告人（Speaker）：王大伟 研究员（浙江大学）

报告时间（Time）：2020年12月31日（周四）10:00

报告地点（Place）：校本部G309

邀请人（Inviter）：李征鸿 曾小东

摘要（Abstract）：

Topological photonics is an emerging research area that focuses on the topological states of classical light. Here we reveal the topological phases that are intrinsic to the particle nature of light, i.e., solely related to the quantized Fock states and the inhomogeneous coupling between them. The Hamiltonian of two cavities coupled with a two-level atom is an intrinsic one-dimensional Su-Schriefer-Heeger model of Fock states. By adding another cavity, the Fock-state lattice is extended to two dimensions with a honeycomb structure, where the strain due to the inhomogeneity of the coupling strengths induces a Lifshitz topological phase transition between a semimetal and three band insulators within the lattice. In the semimetallic phase, the strain is equivalent to a pseudomagnetic field, which results in the quantization of the Landau levels and the valley Hall effect. We further construct a Haldane model where the topological phases can be characterized by the topological markers. This study demonstrates a fundamental distinction between the topological phases of bosons and fermions and provides a novel platform for studying topological physics in dimensions higher than three.

报告人简介：

王大伟，青年千人，香港中文大学博士，浙江大学物理系研究员、博士生导师。主要研究拓扑量子光学、超辐射晶格、海森堡极限下的超辐射测量学、光二极管等。目前发表SCI论文40余篇，其中15篇发表于Science, Physical Review Letters, Nano Lett, Nature Physics和Optica。

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