Exciton Superposition States in CdSe Nanocrystals Measured Using Broadband Two-Dimensional Electronic Spectroscopy
Coherent superpositions among eigenstates are of interest in fields as diverse as photosynthesis and quantum computation. In this report, we used two-dimensional electronic spectroscopy (2D ES) to measure the decoherence time of a superposition of the two lowest-energy excitons in colloidal CdSe nan...
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| Veröffentlicht in: | Nano letters 2012-02, Vol.12 (2), p.880-886 |
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| container_title | Nano letters |
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| creator | Turner, Daniel B Hassan, Yasser Scholes, Gregory D |
| description | Coherent superpositions among eigenstates are of interest in fields as diverse as photosynthesis and quantum computation. In this report, we used two-dimensional electronic spectroscopy (2D ES) to measure the decoherence time of a superposition of the two lowest-energy excitons in colloidal CdSe nanocrystals (cubic phase) in solution at room temperature. In the electron–hole representation, the quantum coherence is, remarkably, a twelve-particle correlation. By comparing the measured 2D ES to simulations, we also explored the effects of inhomogeneous broadening and examined the spectroscopic signatures of biexcitons. |
| doi_str_mv | 10.1021/nl2039502 |
| format | Article |
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| subjects | Cadmium Compounds - chemistry Cadmium selenides Coherence Colloids - chemistry Condensed matter: electronic structure, electrical, magnetic, and optical properties Electronics Exact sciences and technology Excitation spectra Intermetallics Nanocrystals Nanocrystals and nanoparticles Nanoparticles - chemistry Nanostructure Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Physics Quantum Theory Selenium Compounds - chemistry Spectroscopy Spectrum Analysis Temperature Two dimensional |
| title | Exciton Superposition States in CdSe Nanocrystals Measured Using Broadband Two-Dimensional Electronic Spectroscopy |
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