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北京工业大学高能组

Exciton-Polariton in Artificial Lattice & Hybrid System

by Dr 孟 孙 (Center for Theoretical Physics of Complex Systems, IBS School, Korea University of Science and Technology, Korea)

Asia/Shanghai
ID:824 354 685 (腾讯会议)

ID:824 354 685

腾讯会议

Description
腾讯会议(会议ID:824 354 685) In this talk, we discuss two different aspects of many-particle physics. In the first part, we study the Bose–Einstein condensation of microcavity exciton-polaritons in different artificial lattices. Bose–Einstein condensation is a quantum phase transition, which allows the system to macroscopically occupy its ground state and develop coherence spontaneously. Often studied in microcavities, which are optical cavities that trap light at specific wavelengths, exciton-polaritons are a kind of quasiparticle arising from the strong coupling between quantum well excitons and cavity phonons. By periodically aligning cavity pillars in different patterns, one can achieve different artificial lattice structures. With this setup, we apply the driven-dissipative Gross–Pitaevskii equations to investigate the different consequences of the condensation by changing the pump- ing schemes and the design of the trapping potentials. Topics include multivalley condensation, phase selection and intermittency of exciton-polariton condensation, flat band condensation, and exciton-polariton topological insulators. In the second part of this talk, we focus on the electron-scattering properties of a hybrid Bose–Fermi system. We consider a system consisting of a spatially separated two-dimensional electron gas layer and an exciton gas layer that interact via Coulomb forces. We study the temperature dependence of the system’s resistivity with this interlayer electron–exciton interaction and compare the results with the electron–phonon interaction