Quantum-confined Stark shifts of charged exciton complexes in quantum dots

Finley, Jonathan J.; Sabathil, M.; Vogl, P.; Abstreiter, G.; Oulton, Ruth; Tartakovskii, A. I.; Mowbray, D. J.; Skolnick, M. S.; Liew, S. L.; Cullis, A. G.; Hopkinson, M.

doi:10.1103/physrevb.70.201308

Cited by 126 publications

(133 citation statements)

References 19 publications

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“…The redshift of X + relative to X 0 differs from the case of single QDs 24,25 and VQDMs, 26 where blueshifts of the X + state are typically observed. This redshift is one of the distinct PL properties of LQDMs that has been predicted by both pseudopotential 16 and effective mass 17 modeling.…”

Section: -3mentioning

confidence: 90%

Coulomb interaction signatures in self-assembled lateral quantum dot molecules

et al. 2013

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We use photoluminescence spectroscopy to investigate the ground state of single self-assembled InGaAs lateral quantum dot molecules. We apply a voltage along the growth direction that allows us to control the total charge occupancy of the quantum dot molecule. Using a combination of computational modeling and experimental analysis, we assign the observed discrete spectral lines to specific charge distributions. We explain the dynamic processes that lead to these charge configurations through electrical injection and optical generation. Our systemic analysis provides evidence of interdot tunneling of electrons as predicted in previous theoretical work.

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Section: -3mentioning

confidence: 90%

Coulomb interaction signatures in self-assembled lateral quantum dot molecules

et al. 2013

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“…This method provides fully correlated excitonic states ͑X N e N h ͒ which are needed for an accurate estimate of the recombination probability 12,27,28 and energy. [10][11][12][13][14][15][16][17][18][19] Moreover, it gives direct estimates of V eh N e N h , which allows us to study the renormalization of the electronhole attraction upon charging with additional electrons or holes.…”

Section: Theorymentioning

confidence: 99%

“…Indeed, it has been shown that the relative spectral positions of exciton ͑X 0 ͒ and charged exciton ͑X Ϯn ͒ states can be generally inferred from the few-particle correlations. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] The dependence of the recombination rates of neutral exciton, biexciton, and multiexciton complexes on Coulomb interactions has been also described in a number of papers. [24][25][26][27][28][29][30] Much less is known about the recombination rates of positively ͑X + ͒ and negatively ͑X − ͒ charged excitons ͑trions͒.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence spectroscopy of trions in quantum dots: A theoretical description

Climente

Bertoni²,

Goldoni

2008

Phys. Rev. B

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We present a full configuration-interaction study of the spontaneous recombination of neutral and singly charged excitons ͑trions͒ in semiconductor quantum dots from weak-to strong-coupling regimes. We find that the enhancement of the recombination rate of neutral excitons with increasing dot size is suppressed for negative trions and even reversed for positive trions. Our findings agree with recent comprehensive photoluminescence experiments in self-assembled quantum dots ͓P. Dalgarno et al., Phys. Rev. B 77, 245311 ͑2008͔͒ and confirm the major role played by correlations in the valence band. The effect of the temperature on the photoluminescence spectrum and that of the ratio between the electron and hole wave-function length scales are also described.

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“…Ideally, one would like to control the exciton charge state on an individual quantum dot. This can be accomplished utilizing metal-oxide-semiconductor or metal-semiconductor structures whereby tunneling of the electrons in and out of the quantum dot is achieved via electric fields [42,[57][58][59][60][61][62]. A single quantum dot in a pyramidal nanotemplate forms an ideal geometry for devices requiring metal gates for application of electric fields and optical access for PL spectroscopy.…”

Section: Optical Spectroscopymentioning

confidence: 99%

“…Fig. 9 shows the emission energies of X and X as a function of applied field, with an offset added to X assuming a negligible reduction in dipole due to the additional electron [60]. The field is calculated by simultaneously solving Poisson's equation and the continuity equations for electrons and holes, whilst utilizing the drift diffusion model for charge transport [63].…”

Section: Optical Spectroscopymentioning

confidence: 99%

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

Dalacu¹,

Reimer

Frédérick

et al. 2010

Laser & Photonics Reviews

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Strong confinement of charges in few electron systems such as in atoms, molecules and quantum dots leads to a spectrum of discrete energy levels that are often shared by several degenerate quantum states. Since the electronic structure is key to understanding their chemical properties, methods that probe these energy levels in situ are important. We show how electrostatic force detection using atomic force microscopy reveals the electronic structure of individual and coupled self-assembled quantum dots. An electron addition spectrum in the Coulomb blockade regime, resulting from a change in cantilever resonance frequency and dissipation during tunneling events, shows one by one electron charging of a dot. The spectra show clear level degeneracies in isolated quantum dots, supported by the first observation of predicted temperature-dependent shifts of Coulomb blockade peaks. Further, by scanning the surface we observe that several quantum dots may reside on what topologically appears to be just one. These images of grouped weakly and strongly coupled dots allow us to estimate their relative coupling strengths.

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Quantum-confined Stark shifts of charged exciton complexes in quantum dots

Cited by 126 publications

References 19 publications

Coulomb interaction signatures in self-assembled lateral quantum dot molecules

Coulomb interaction signatures in self-assembled lateral quantum dot molecules

Photoluminescence spectroscopy of trions in quantum dots: A theoretical description

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

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