Quantum dynamics of excitons and spin-valley optoelectronics
Our group is interested in investigating the exciton and spin-valley dynamics in low-dimensional materials, such as van der Waals (vdW) two-dimensional (2D) materials. Using scanning microscopy systems combined with ultrafast lasers, we can perform spatially-resolved (~ 1 µm) and temporally-resolved (~ 100 fs) photoresponse in these materials. Recent works include optoelectronic manipulation of valley-locked spin-photocurrents  and exciton dynamics in 2D TMDs (transition metal dichalcogenides) vdW materials [2-4].
Quantum spintronics and plasmonics
We explore femtosecond laser-controlled spintronic and plasmonic applications using topological insulators or plasmonic metamaterials. Injection of the time-delayed optical pulses selectively excite the spin-polarized electrons, and thus may lead us to develop new optically-controlled ultrafast spintronic devices. Emphasis is made on the electrical and optical manipulation of spin and plasmon by integrating two or more dissimilar materials [1-4].