Valleytronics using van der Waals heterostructures
Our group is interested in quantum optical manipulation of valleytronics using van der Waals (vdW) 2D materials, such as graphene and transition metal dichalcogenides (TMD). With the ability to fabricate heterostructure devices, we investigate optoelectronic responses of spin, valley, and excitons, from the visible to the terahertz (THz) range.
 Nature Nanotechnology 13, 910-914 (2018) (pdf).
 Nature Communications 9, 351 (2018) (pdf).
 Nature Communications 7, 13569(2016) (pdf).
 Nature Communications 7, 10768 (2016) (pdf).
Topological phases of matters
We explore optically excited correlated quasiparticles in topological phases of matters. 3D, 2D topological insulators or magnetic topological insulators are among a few examples, and these materials are largely supported by Rutgers University. Currently, we focus on novel quantum electrical and optical phenomena by integrating two or more dissimilar topological materials.
 ACS Photonics 5(8), 3347-3352 (2018) (pdf).
 Nano Letters 18, 734 (2018) (pdf).
 Nature Communications 6, 8814 (2015) (pdf).
 Advanced Materials 28, 1495 (2016) (pdf).
Quantum sensors and spin qubits
Our group is interested in developing single photon emitters using such as point defects in NV diamond or 2D materials. We also investigate the electron/nuclear spin qubits aiming at quantum sensors, and toward scalable quantum-optic interfaces. This particular work is supported by the NRF Korea-funded ERC (Engineering Research Center) for developing scalable quantum computers.