Control of Phonons in Semiconductor Nanocrystals via Femtosecond Pulse Chirp-Influenced Wavepacket Dynamics and Polarization
| Autor: | Brenna R. Walsh, Jonathan I. Saari, Patanjali Kambhampati, Anne Myers Kelley, Jonathan Mooney, Michael M. Krause |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Condensed Matter::Other Femtosecond pulse business.industry Phonon Wave packet Electronic structure Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Molecular physics Surfaces Coatings and Films Condensed Matter::Materials Science Materials Chemistry Chirp Optoelectronics Semiconductor nanocrystals Physical and Theoretical Chemistry Polarization (electrochemistry) business |
| Zdroj: | The Journal of Physical Chemistry B. 117:15651-15658 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp406323f |
| Popis: | The realistic electronic structure of semiconductor nanocrystals is characterized by excitonic fine structure and atomistic symmetry breakings that are challenging to resolve experimentally. Exciton-phonon coupling is one of the most sensitive measures of the excitonic wave functions of the nanocrystals. Here, we exploit this sensitivity via chirped pulse and polarization resolved femtosecond pump/probe spectroscopy of colloidal CdSe nanocrystals. Pulse chirp measurements and simulations are used to explore the contributions of excited- and ground-state vibrational wavepackets to the observed coherent phonons in the pump/probe signals. Polarization resolved pump/probe spectroscopy is used to explore electronic and vibrational polarization anisotropies. We find no electronic polarization anisotropy, whereas vibrational anisotropy is preserved. |
| Databáze: | OpenAIRE |
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