Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

Details Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

2010-05-21

arxiv.org/abs/1005.4069v2

Phys. Rev. Lett. 105, 137401 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.105.137401

We have shown theoretically that efficient multiple exciton generation (MEG) by a single photon can be observed in small nanocrystals (NCs). Our quantum simulations that include hundreds of thousands of exciton and multi-exciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond timescale. Including phonon relaxation confirms that efficient MEG requires the exciton--biexciton coupling time to be faster than exciton relaxation time.

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