Full Configuration Interaction Calculations of Electron-Hole Correlation Effects in Strain-Induced Quantum Dots

Braskén, M.; Lindberg, M.; Sundholm, Dage; Olsen, Jeppe

doi:10.1002/(sici)1521-3951(200104)224:3<775::aid-pssb775>3.0.co;2-y

Cited by 13 publications

(2 citation statements)

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“…This shortcoming becomes potentially significant for QD, which contain both electrons and holes, with repulsive and attractive carrier-carrier interactions. Braskén and co-workers have modelled SIQD using an effective-mass CI approach which also includes the Coulomb-correlation effects [43,[105][106][107]. More recently, Vänskä et al have reported on the modelling of multi-exciton states in SIQD using the coupled cluster approach [108].…”

Section: Electronic Structure Ii-many-particle Descriptionmentioning

confidence: 99%

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Theory of the electronic structure and carrier dynamics of strain-induced (Ga, In)As quantum dots

Boxberg

Tulkki

2007

Rep. Prog. Phys.

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Strain-induced quantum dots (SIQD) confine electrons and holes to a lateral potential minimum within a near-surface quantum well (QW). The potential minimum is located in the QW below a nanometre-sized stressor crystal grown on top of the QW. SIQD exhibit well-resolved and prominently atomic-like optical spectra, making them ideal for experimental and theoretical studies of mesoscopic phenomena in semiconductor nanocrystals.In this report we review the theory of strain-induced confinement, electronic structure, photonics and carrier relaxation dynamics in SIQD. The theoretical results are compared with available experimental data. Electronic structure calculations are mainly performed using the multiband envelope function approach. Many-body effects are discussed using a direct diagonalization method, albeit, for the sake of computational feasibility, within a two-band model.The QD carrier dynamics are discussed in terms of a master equation model, which accounts for the details of the electronic structure as well as the leading photon, phonon and Coulomb interaction processes. We also discuss the quantum confined Stark effect, the Zeeman splitting and the formation of Landau levels in external fields. Finally, we review a recent theory of the cooling of radiative QD excitons by THz radiation. In particular we discuss the resonance charge transfer of holes between piezoelectric trap states and the deformation potential minima. The agreement between the theory and experiment is fair throughout, but calls for further investigations.

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Section: Electronic Structure Ii-many-particle Descriptionmentioning

confidence: 99%

“…Braskén and co-workers have modelled SIQD using an effective-mass CI approach which also includes the Coulomb-correlation effects [43,[105][106][107]. More recently, Vänskä et al have reported on the modelling of multi-exciton states in SIQD using the coupled cluster approach [108].…”

Section: Electronic Structure Ii-many-particle Descriptionmentioning

confidence: 99%

Theory of the electronic structure and carrier dynamics of strain-induced (Ga, In)As quantum dots

Boxberg

Tulkki

2007

Rep. Prog. Phys.

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Computational methods for studies of multiexciton complexes

Vänskä

Lindberg

Olsen

et al. 2006

Physica Status Solidi (b)

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PACS 71.35.Pq, 72.20.Jv, 73.21.La Powerful computational methods are presented for studies of energy levels, photon-recombination rates, and phonon-relaxation rates of neutral and charged multiexciton complexes at correlated levels of theory. The electron -hole system is described by a two-band effective-mass Hamiltonian. The one-particle functions are expanded in a basis set consisting of anisotropic Gaussian functions. The many-body Hamiltonian constructed in the space of the antisymmetric products of one-particle functions is diagonalized using general coupled-cluster and configuration-interaction methods. The expansion coefficients of the coupledcluster and configuration-interaction wave functions are obtained by solving the corresponding equations using direct iterative algorithms. We demonstrate the potential of the computational approaches by calculating total energies of multiexciton complexes at coupled-cluster and configuration-interaction levels.Computational methods for studies of radiative recombination and phonon-relaxation rates have also been developed and results are reported for radiative recombination rates and recombination energies of the exciton, biexciton, and of the positive and the negative trions confined in a InGaAs/GaAs quantum-dot sample. Phonon-relaxation rates have been calculated for a few low-lying g ∆ states of the exciton complex of the same quantum-dot sample.

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