Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.08560 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929343370887168 |
|---|---|
| author | Wolf, Eric A. Finton, Drew M. Zoutenbier, Vincent Biaggio, Ivan |
| author_facet | Wolf, Eric A. Finton, Drew M. Zoutenbier, Vincent Biaggio, Ivan |
| contents | We observe quantum beats in the nanosecond-scale photoluminescence decay of rubrene single crystals after photoexcitation with short laser pulses in a magnetic field of 0.1 to 0.3 T. The relative amplitude of the quantum beats is of the order of 5\%. Their frequency is $1.3$ GHz when the magnetic field is oriented parallel to the two-fold rotation axis of the rubrene molecules and decreases to $0.6$ GHz when the magnetic field is rotated to the crystal's molecular stacking direction. The amplitude of the quantum beats decays alongside the non-oscillatory photoluminescence background, which at low excitation densities has an exponential decay time of $ 4.0 \pm 0.2$~ns. We interpret this as the effective lifetime of a multiexciton state that originates from singlet-fission and can undergo geminate recombination back to the singlet state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_08560 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quantum Beats of a Multiexciton State in Rubrene Single Crystals Wolf, Eric A. Finton, Drew M. Zoutenbier, Vincent Biaggio, Ivan Materials Science Quantum Physics We observe quantum beats in the nanosecond-scale photoluminescence decay of rubrene single crystals after photoexcitation with short laser pulses in a magnetic field of 0.1 to 0.3 T. The relative amplitude of the quantum beats is of the order of 5\%. Their frequency is $1.3$ GHz when the magnetic field is oriented parallel to the two-fold rotation axis of the rubrene molecules and decreases to $0.6$ GHz when the magnetic field is rotated to the crystal's molecular stacking direction. The amplitude of the quantum beats decays alongside the non-oscillatory photoluminescence background, which at low excitation densities has an exponential decay time of $ 4.0 \pm 0.2$~ns. We interpret this as the effective lifetime of a multiexciton state that originates from singlet-fission and can undergo geminate recombination back to the singlet state. |
| title | Quantum Beats of a Multiexciton State in Rubrene Single Crystals |
| topic | Materials Science Quantum Physics |
| url | https://arxiv.org/abs/2405.08560 |