Exciton tunnelling in ZnCdSe quantum well/CdSe quantum dots

Hua, Jin; Zhang, Ligong; Zheng, Zhong; Kong, Xianggui; An, Linan; Shen, Dezhen

doi:10.7498/aps.53.3211

Cited by 8 publications

(2 citation statements)

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“…For example, in an investigation by Saito and Kayanuma [33], it was shown that a ballistic Wannier exciton exhibits tunnelling resonances through a single barrier heterostructure by the same mechanism as discussed in this paper and our previous studies. The methods and results in our investigation are applicable to experimental and theoretical research involving the tunnelling of excitons [34].…”

Section: Connection With Realistic Systemsmentioning

confidence: 94%

Tunnelling of a molecule with many bound states in three dimensions

Shegelski¹,

Pittman²,

Vogt³

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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We study in three dimensions a diatomic homo-nuclear molecule with many bound states incident upon a potential barrier. We consider different initial states for the molecule and take into account transitions between rotational states of the molecule during the process in which the entire molecule tunnels past or is reflected by the external potential barrier. We show the manner in which the transmission resonances are affected by having many bound states. We find that the transmission probability profile in three dimensions is markedly different from that for two bound states in three dimensions, and for many bound states in one dimension. We find important new results. One result is that resonant or near resonant tunnelling and resonant or near resonant reflection can both occur within a small energy range of the molecule. We also find that tunnelling with transmission probability close to unity can occur over a wide energy range.

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Section: Connection With Realistic Systemsmentioning

confidence: 94%

Tunnelling of a molecule with many bound states in three dimensions

Shegelski¹,

Pittman²,

Vogt³

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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“…Finally, as reported in Refs. [21,22], there is excitation energy transfer from small QDs to large ones through tunnelling effects, and as a result, the PL intensity at the long wavelengths is higher than that at the shorter wavelengths. In addition, it is seen that the emission peaks show a red-shift with respect to the lowest 1S-1S absorption for all the four samples.…”

Section: Results and Analysismentioning

confidence: 99%

Size-dependent optical properties and carriers dynamics in CdSe/ZnS quantum dots

Wang

et al. 2008

Chinese Phys. B

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Size-dependence of optical properties and energy relaxation in CdSe/ZnS quantum dots (QDs) were investigated by two-colour femtosecond (fs) pump-probe (400/800 nm) and picosecond time-resolved photoluminescence (ps TRPL) experiments. Pump-probe measurement results show that there are two components for the excited carriers relaxation, the fast one with a time constant of several ps arises from the Auger-type recombination, which shows almost particle sizeindependence. The slow relaxation component with a time constant of several decades of ns can be clearly determined with ps TRPL spectroscopy in which the slow relaxation process shows strong particle size-dependence. The decay time constants increase from 21 to 34 ns with the decrease of particle size from 3.2 to 2.1 nm. The room-temperature decay lifetime is due to the thermal mixing of bright and dark excitons, and the size-dependence of slow relaxation process can be explained very well in terms of simple three-level model.

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