My research is mainly on studying valley polarization controlling in different transition metal dichalcogenides (TMD) heterostructures and exploring TMD device structures with higher efficiency. Valley pseudospin is an analogy to spin, giving rise to a new quantum index for people’s manipulation and it has potential application in quantum computing in the future. 2D TMD is the most promising candidate material for useful valleytronic application from its strong excitonic effect and spin-valley locking properties. In TMD heterostructure, the strongly unbalanced valley polarization can be generated with circularly polarized light of minimal power. For example, in WSe2/MoSe2, people can use as low as a few nanowatt optical power to generate valley polarization of about 90%. This high efficiency way to manipulating quantum number provides people a low energy consuming possibility in future quantum information processing.
Advisor: Xiaodong Xu – Physics