Time：2:00-3:30 PM, Monday, March 8th, 2021

Venue: Room 213, Building 4, Yunqi Campus；ZOOM webinar (Meeting ID: 627 2168 5060)

Host: Alexey Kavokin, Chair Professor, School of Science, Westlake University

Speaker：

Ivan A. Shelykh, Professor

Faculty of Physical Sciences of Physical Sciences and ITMO University

Biography:

Dr. Ivan A. Shelykh focus on excitons in carbon and organic materials, which differ substantially from excitons in semiconductor structures. They usually have bigger binding energies and smaller radia, which enhances their coupling with light and decreases nonlinearities stemming from exciton- exciton interactions. Moreover, the role of the dark states can become crucial: they can have binding energies substantially bigger than those of the bright states, and thus can lead to the luminescence quenching.

Abstract:

In the talk we will consider two examples of strong light matter coupling physics in organics. First, we will demonstrate how the coupling with photonic mode of planar resonator can lead to the exciton brightening in carbon nanotubes. Second, we will discuss the origin of the blueshift in organic microcavities and claim that it mainly stems from the quenching of the Rabi splitting with increase of the excitonic concentration and not from Coulomb exciton- exciton interactions as in the case of semiconductor microcavities.

Contact:

School of Science, Miss Yiqing Bi, biyiqing@westlake.edu.cn