Center for Molecular Spectroscopy and Dynamics

   IBS Center for Molecular Spectroscopy and Dynamics

■        SPEAKER
Prof. Su-Hyun Gong (Department of Physics, Korea University)

■        TITLE
Valley pseudospin dependent light-matter interaction in 2D-layered semiconductors

■     ABSTRACT
The emergence of transition metal dichalcogenides (TMD) layers has sparked significant research interest and led to the rapid development of valleytronics. A monolayer of TMD materials has direct bandgaps consisting of two (energy-degenerate) valleys at the corners of the Brillouin zone (K, K’), which provide an opportunity to manipulate the additional degree of freedom, so called the valley degree of freedom. In this talk, the valley-selective exciton–light coupling in a TMD layer will be discussed. In weak coupling regime, we demonstrated directional emission of valley-polarized exciton into plasmonic eigenstates of a silver nanowire. In strong coupling regime, we investigated coherent coupling between exciton and photon in a thick TMD layer. Valley-dependent exciton–light coupling offers a novel platform for realization of valley transport even at room temperature without any magnetic fields.

■     DATE AND VENUE
 November 15, 2021 (Monday, 15:00 - 16:00)  

         Seminar Room A (116), KU R&D Center

■        LANGUAGE
Korean

■        INVITED BY
Prof. Tai Hyun Yoon