講演情報
[9p-P04-4]Comparative Study of Many-Body Interaction Models Using Two-dimensional
Coherent Spectroscopy
〇(DC)Pradeep Kumar1, Bhaskar De1, Rishabh Tripathi1, Rohan Singh1 (1.Indian Institute of Science Education and Research, Bhopal 462066, India)
キーワード：
many-body interactions、two-dimensional coherent spectroscopy、phenomenological models
The nonlinear optical response of semiconductor nanostructures is significantly influenced by many-body interactions (MBIs), such as exciton-exciton coupling, which play a key role in coherent coupling phenomena crucial for quantum information processing. These effects manifest in the coherence decay of excitonic transitions and are probed using techniques like four-wave mixing (FWM) and two-dimensional coherent spectroscopy (2DCS). While microscopic models provide detailed insight, they are computationally intensive and limited in interpretability. Phenomenological models like modified optical Bloch equations (MOBEs) and the anharmonic oscillator (AO) model offer practical alternatives. MOBEs treat excitons as two-level fermionic systems with interaction-induced modifications, whereas the AO model considers excitons as interacting bosons in an anharmonic ladder. Here, we demonstrate the empirical equivalence of these two models through 2DCS simulations, showing consistent spectral line shapes and agreement with experiments. These insights are valuable for advancing quantum dot lasers and TMDC-based valleytronic devices.