Disentangling Many-Body Effects in the Coherent Optical Response of 2D Semiconductors
Chiara Trovatello, Florian Katsch, Qiuyang Li, Xiaoyang Zhu, Andreas Knorr, Giulio Cerullo, Stefano Dal Conte
Abstract
. In order to disentangle many-body effects, we perform exciton line-shape analysis, and we study its temporal dynamics as a function of the excitation photon energy and fluence. We find that resonant photoexcitation produces a blue shift of the A exciton, while for above-resonance photoexcitation the transient response at the optical bandgap is largely determined by a reduction of the exciton oscillator strength. Microscopic calculations based on excitonic Heisenberg equations of motion quantitatively reproduce the nonlinear absorption of the material and its dependence on excitation conditions.
Topics & Concepts
PhotoexcitationExcitonFemtosecondExcitationPhysicsMany-body theoryOscillator strengthAtomic physicsCoulombCondensed matter physicsResonance (particle physics)SemiconductorMolecular physicsLaserOpticsOptoelectronicsQuantum mechanicsSpectral lineElectron2D Materials and ApplicationsPerovskite Materials and ApplicationsQuantum Dots Synthesis And Properties