1. Single atom spectroscopy
With the recently developed photoionisation spectroscopy [C. Yin et al., Nature, 497, 91 (2013)], we can study the defect centres in solids on a single atom level. This project focuses on the site symmetry, electronic dynamics, level repulsion, and state mixing of a single atom in silicon.

2. Optical control and on-chip cavity coupling of single atoms
A single spin of a single atom is a good candidates for qubit, a basic component in a future quantum computer. The current challenge is to couple multiple spins over macroscopic scales. Optical control and on-chip cavity coupling provide a promising solution to this problem. The first milestone has been achieved by showing optical addressing of single spins in silicon .

3. Spin polarised photocurrent in strong spin-orbit coupling materials
Spin-orbit coupling plays a key role in spintronics, which aims to combine both the spin and charge properties of electrons and to produce more powerful electronic devices. Chunming has studied strong spin-orbit coupling materials and contributes to the band-structure design of spintronic devices, detection of spin-polarised current at room temperature, gate-tuning of spin splitting, etc. [C. Yin et al., Nano Letters, 13, 2024 (2013)].