Observation of the "Dark Exciton" in CdSe Quantum Dots

Abstract

We use external magnetic fields to identify the band edge emitting state in CdSe quantum dots. The field dependence of emission decays and LO phonon spectra show the importance of exciton spin dynamics in the recombination mechanism. To interpret our results we calculate the band edge exciton structure, including the effects of the electron-hole exchange interaction and a nonspherical shape. The exchange term, negligible in the bulk, is strongly enhanced by quantum confinement and allows the observation of an optically passive "dark" excitonic state.

Keywords

ExcitonQuantum dotPhysicsBiexcitonCondensed matter physicsExchange interactionSpin (aerodynamics)ElectronMagnetic fieldPhononAtomic physicsQuantum mechanicsFerromagnetism

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Publication Info

Year: 1995
Type: article
Volume: 75
Issue: 20
Pages: 3728-3731
Citations: 827
Access: Closed

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APA Style

                            
                                
                                    M. Nirmal, 
                                
                                    David J. Norris, 
                                
                                    Masaru Kuno
                                
                                et al.
                            
                            (1995). 
                            Observation of the "Dark Exciton" in CdSe Quantum Dots. 
                            Physical Review Letters
                            , 75
                            (20)
                            , 3728-3731.
                            https://doi.org/10.1103/physrevlett.75.3728
                        

Identifiers

DOI: 10.1103/physrevlett.75.3728