5 papers
Temperature-Induced Crossover of Coherent Phonon Mechanisms in Chiral 2D Perovskites
Katherine A Koch, Matthew P Hautzinger, Matthew C Beard +1
The coupling between electronic excitations and lattice degrees of freedom fundamentally dictates the optoelectronic functionality of hybrid perovskites. While the potential energy…
Biexcitons in Ruddlesden-Popper Metal Halides Probed by Nonlinear Coherent Spectroscopy
Katherine A. Koch, Carlos Silva-Acuña, Ajay Ram Srimath Kandada
Excitons and their correlated complexes underpin the rich photophysics of quantum-confined semiconductors. Among these, biexcitons -- bound states of two electrons and two holes --…
Nonlinear Dynamics in the Formation of Molecular Polariton Condensates
Evan J Kumar, Katherine A Koch, Rishabh Kaurav +5
Exciton-polaritons - hybrid light-matter quasiparticles - can undergo Bose-Einstein-like condensation at elevated temperatures owing to their lower effective mass. This becomes eve…
Spectroscopic signatures of biexcitons: A case study in Ruddlesden-Popper lead-halides
Katherine A. Koch, Esteban Rojas-Gatjens, Martin Gomez-Dominguez +3
Exciton-exciton interactions are fundamental to the light-emitting properties of semiconductors, influencing applications from lasers to quantum light sources. In this study, we in…
Fine-Tuning Exciton Polaron Characteristics via Lattice Engineering in 2D Hybrid Perovskites
Katherine A Koch, Martin Gomez-Dominguez, Esteban Rojas-Gatjens +4
The layered structure of 2D metal halide perovskites (MHPs) consisting of an ionic metal halide octahedral layer electronically separated by an organic cation, exhibits strong coup…