Coherent Multi-Dimensional Spectroscopy Reveals Homogeneous Lineshape Dynamics in CsPbBr<sub>3</sub> Quantum Dots
Bibliographic record
Abstract
Lead halide perovskite (LHP) quantum dots (QD) are an attractive material for light emissive applications due to their lattice, which is both dynamically disordered and defect tolerant. The development of LHP QD for quantum emitters critically depends on the characterization of their homogeneous lineshapes. Homogeneous lineshapes are measured by single dot photoluminescence spectroscopy only at cryogenic temperatures for which their lattice dynamics are frozen out. There are presently no experiments which reveal the lineshapes at 300 K, let alone their dynamics due to lattice fluctuations. Here, we perform coherent multi-dimensional spectroscopy (CMDS) on a broad size range of CsPbBr 3 QD at 300 K to observe homogeneous lineshapes and their dynamics on the femtosecond time scale of lattice motions. In contrast to linear spectroscopies, these nonlinear CMDS experiments unambiguously reveal that the room temperature homogeneous line widths are both narrow and size independent at 300 K. The ensuing femtosecond line shape dynamics is governed by size-dependent exciton-lattice interactions. These results demonstrate the potential of LHP QD for high-temperature quantum light sources.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".