Research

Our group studies the ultrafast dynamics of correlated quantum materials with femtosecond pump-probe optical spectroscopy. The correlation between the lattice, charge, spin, and orbital degrees of freedom results in complex quantum states. It is vital to clarify the coupling multiple degrees of freedom for understanding formation of quantum states. Compared to the equilibrium studies, ultrafast non-equilibrium methods offers unique perspective and advantages for disentangling multiple degrees of freedom by tracking their evolution and interaction separately. For example, with ultrafast optical spectroscopy, we can directly measure the electron phonon coupling constant, observe the phonon bottleneck effect induced superconductivity gap decrease, obtain superconductivity gap and transition temperature, etc. Based on the data, we can analyze the electron phonon interactions and their contribution to the correlated quantum materials. Besides, our group utilizes the time-domain THz spectroscopy, Raman spectroscopy, spatial self-phase modulation etc, to study the novel quantum states and different degrees of freedom in correlated materials.