■ 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.