Date 2019-05-14 

■ Title:  Chiral valley-photon interaction in 2D semiconductor


 Speaker:  Prof. Su-Hyun Gong (Dept. of Physics, Korea Univ.)


■ Data and time:  5/14(Tue) 16:00


■ Venue:  Applied Engineering Building (W1) 1st Floor, Multimedia Lecture Room


 Host :  Prof. Jonghwa Shin

 Abstract :   

In the non-paraxial regime of light, spin and angular momentum cannot be separated but are coupled, the so-called spin-orbit interaction of light. One novel consequence of this spin-orbit interaction of light is spin-controlled directional coupling of light. Here, I present the valley dependent directional emission of transition metal dichalcogenides into plasmonic eigenstates of a silver nanowire. The highly confined mode of a plasmonic nanowire provides a high degree of local transverse optical spin, and its handedness is locked to the propagation direction of the mode. As a result, the emission from the two different valleys will couple to the plasmonic modes propagating in opposite directions. This result paves the way towards a new platform for exploiting a valley pseudospin in integrated valleytronics devices using nanophotonics structures.