Investigation of excitonic topological states

The exciton, a bound state of an electron and a hole, stands out as a fundamental quasiparticle in semiconductors, resulting from coherent light-matter interactions. The recent observation of excitonic states in topological insulators introduces a new direction for studying excitonic states combined with topological effects. However, despite this progress, many unknown aspects remain, especially concerning their fundamental properties. In this talk, by systematically varying specific parameters, we will showcase potential methods to control the excitonic behaviors of these topological states, as measured by ultrafast techniques. Additionally, we will discuss the results in terms of correlations.