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

Abstract

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.

References in corpus (4)

• High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy
• Carrier multiplication yields in PbS and PbSe nanocrystals measured by transient photoluminescence
• Carrier multiplication yields in CdSe and CdTe nanocrystals by transient photoluminescence
• Distribution of carrier multiplication rates in CdSe and InAs nanocrystals

Cited by in corpus (11)

• Numerical Study of Carrier Multiplication Pathways in Nanocrystalline and Bulk Form of PbSe
• Theory of highly excited semiconductor nanostructures including Auger coupling: exciton-bi-exciton mixing in CdSe nanocrystals
• Biexciton generation rates in CdSe nanorods are length independent
• Numerical analysis of carrier multiplication mechanisms in nanocrystal and bulk forms of PbSe and PbS
• Coulomb matrix elements for the impact ionization process in nanocrystals: the envelope function approach
• Optical recombination of biexcitons in semiconductors
• Probing Interband Coulomb Interactions in Semiconductor Nanocrystals with 2D Double-Quantum Coherence Spectroscopy
• Ultrafast Dynamics of Carrier Multiplication in Quantum Dots
• Inter-band Coulomb coupling in narrow gap semiconductor nanocrystals: $\mathbf{k}\cdot \mathbf{p}$ theory
• Dynamics of dissipative multiple exciton generation in nanocrystals
• Efficiency of the coherent biexciton admixture mechanism for multiple exciton generation in InAs nanocrystals