Spectroscopy and Microscopy at Atomic Level Laboratory (SMALL) is a research group lead by Dr. Shaowei Li in the department of chemistry and biochemistry. We combine optical techniques with scanning probe microscopy to explore the quantum properties of single molecules and low dimensional materials in both real and temporal spaces.
LOW-DIMENSIONAL QUANTUM MATERIALS
We utilize the ultra-high spatial resolution of STM to induce and control chemical reactions that involve low-dimensional quantum systems such as atoms, molecules, and 2D materials. The structural, electronic, and vibrational information of both the reactants and products can be probed in real space with STM. Our experimental approach can distinguish the spatial inhomogeneity in chemical reactions which is not possible in the ensemble measurements.
ATOMIC SCALE PHOTOCHEMISTRY
Inducing electronic or vibrational excitations of molecules using photons is the most fundamental process of photochemical reactions. At "SMALL", we excite the molecules in the STM junction with photons and probe the photoinduced transition using electron tunneling. The electronic excitation such as HOMO-LUMO transitions can be achieved with visible/near-infrared light, the vibrational excitation can be induced using mid-far infrared light.