Nanoscale chiral valley-photon interface through optical spin-orbit coupling
Su-Hyun Gong1,2, Filippo Alpeggiani1,2, Beniamino Sciacca2
1Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
Abstract:
The emergence of two-dimensional transition metal dichalcogenide materials has sparked intense activity in valleytronics, as their valley information can be encoded and detected with the spin angular momentum of light. We demonstrate the valley-dependent directional coupling of light using a plasmonic nanowire-tungsten disulfide (WS2) layers system. We show that the valley pseudospin in WS2 couples to transverse optical spin of the same handedness with a directional coupling efficiency of 90 ± 1%. Our results provide a platform for controlling, detecting, and processing valley and spin information with precise optical control at the nanoscale.
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