Carrier dynamics is a research area in the field of condensed matter physics that focuses on the study of how charged particles, known as carriers, move and interact within a material. This field is concerned with understanding the behavior of carriers in response to external stimuli such as electric fields, light, and temperature changes. By studying carrier dynamics, researchers can gain insight into the electrical, optical, and thermal properties of materials, which has important implications for the development of new electronic and optoelectronic devices. Techniques used in carrier dynamics research include time-resolved spectroscopy, ultrafast laser experiments, and numerical simulations.