6 papers
Real-Time Formation of a Landau Polaron
Priya Nagpal, Arnab Ghosh, Helene Seiler +2
Polarons are electronic excitations dressed by a self-consistent lattice distortion, yet their formation has not been directly resolved in real time. We develop a microscopic lines…
Dynamic Lattice Disorder and Collective Dipole Coupling Give Rise to Dicke Physics in Perovskite Quantum Dots
Priya Nagpal, Patanjali Kambhampati
Halide perovskite quantum dots exhibit cooperative optical phenomena that are absent in conventional semiconductor nanocrystals, including exciton superradiance, superabsorption, a…
Optical gain in colloidal quantum dots is limited by biexciton absorption, not biexciton recombination
Davide Zenatti, Patanjali Kambhampati
Despite three decades of experimental study, optical gain in colloidal quantum dots still lacks a microscopic theory capable of explaining gain thresholds approaching one exciton p…
Time-Reversed Superfluorescence in a Polaronic Quantum Material
Arnab Ghosh, Patrick Brosseau, Dmitry N. Dirin +2
Superfluorescence, the cooperative burst of spontaneous emission from an ensemble of dipoles, arises when microscopic oscillators spontaneously synchronize their phases. Here we sh…
Landau Polarons as Generators of Quantum-Coherent States
Arnab Ghosh, Patrick Brosseau, Dmitry N. Dirin +3
Since Landau's theory, polarons have been understood as quasiparticles in which charges are dressed by the lattice field, yet decades of transport and spectroscopic studies have yi…
A Path towards Thresholdless Colloidal Quantum Dot Lasers by Solving Decades of Mythology on Optical Gain
Davide Zenatti, Patanjali Kambhampati
The semiconductor quantum dot (CQD) was first conceived in the 1980s as offering potential for future lasers. Following high quality solution phase synthesis of colloidal CQD (CCQD…