From quantum dots to quantum wires: Electronic structure of semiconductor nanorods

Planelles, Josep; Royo, Miquel; Ballester, Ana; Pí, M.

doi:10.1103/physrevb.80.045324

Cited by 22 publications

(12 citation statements)

References 28 publications

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“…Therefore, a more general description is needed in order to take subband mixing into account. Quantitatively exact modeling of such nontrivial optical properties of nanostructures must be based on atomistic or multi-band kp methods [10,12]. However, it may be useful and interesting to have a simple semi-quantiative model that would not only elucidate the physical mechanism of the polarization but also yield an estimate of the expected effect in terms of the shape parameters.In this contribution, we present a "minimal" theory that is able to account for the observed DOP in the QDash luminescence.…”

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confidence: 99%

Hole Subband Mixing and Polarization of Luminescence from Quantum Dashes: A Simple Model

et al. 2011

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In this paper, we address the problem of luminescence polarization in the case of nanostructures characterized by an in-plane shape asymmetry. We develop a simple semi-qualitative model revealing the mechanism that accounts for the selective polarization properties of such structures. It shows that they are not a straightforward consequence of the geometry but are related to it via valence subband mixing. Our model allows us to predict the degree of polarization dependence on the in-plane dimensions of investigated structures assuming a predominantly heavy hole character of the valence band states, simplifying the shape of confining potential and neglecting the influence of the out-of-plane dimension. The energy dependence modeling reveals the importance of different excited states in subsequent spectral ranges leading to non-monotonic character of the degree of polarization. The modeling results show good agreement with the experimental data for an ensemble of InAs/InP quantum dashes for a set of realistic parameters with the heavy-light hole states separation being the only adjustable one. All characteristic features are reproduced in the framework of the proposed model and their origin can be well explained and understood. We also make some further predictions about the influence of both the internal characteristics of the nanostructures (e.g. height) and the external conditions (excitation power, temperature) on the overall degree of polarization.

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confidence: 99%

Hole Subband Mixing and Polarization of Luminescence from Quantum Dashes: A Simple Model

et al. 2011

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“…The FCI program used is the same as in Ref. 27. As in such a paper, a basis set ensuring saturation along the NR axis is employed.…”

Section: Methods Validation and Illustrative Calculationsmentioning

confidence: 99%

Dielectric confinement in quantum dots of arbitrary shape within the local spin density approximation: Diluted regimes in elongated quantum dots

Movilla

Pí

Planelles

2010

Journal of Applied Physics

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Tetrahedral chalcopyrite quantum dots for solar-cell applications Appl. Phys. Lett. 99, 111907 (2011) Optical routing and switching of energy flow in nanostructure systems Appl. Phys. Lett. 99, 113113 (2011) Excitations in doped quantum dot induced by accelerating impurity center J. Appl. Phys. 110, 054314 (2011) Symmetry reduction in multiband Hamiltonians for semiconductor quantum dots: The role of interfaces and higher energy bands J. Appl. Phys. 110, 053710 (2011) Compositional effects on the electronic structure of ZnSe1xSx ternary quantum dots Appl. Phys. Lett. 99, 101902 (2011) Additional information on J. Appl. Phys. We propose a simplified and computationally feasible model accounting for the dielectric confinement in arbitrarily shaped many-electron quantum dots, within the local spin density approximation. The model yields quite a good agreement with full configuration interaction calculations including exact dielectric confinement. The model is used to study the influence of the dielectric confinement on the electronic charge distribution of elongated quantum dots in the low density regime.

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“…The transition to the Fermi liquid goes through an intermediate phase, called charge-density wave ͑CDW͒,with N / 2 peaks in the density profile. 2,[11][12][13] This phase may also be considered as a partially melted Wigner molecule.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent paper, 13 we theoretically studied, within the local spin-density-functional theory ͑LSDFT͒, the electronic structure of nanorods ͑NRs͒, elongated QDs which constitute the bridge between zero-dimensional QDs and one-dimensional quantum wires ͑QWs͒, and monitorized the Wigner crystallization in the addition energy spectra. Note that, by changing the gate voltage attached to a nanocrystal, tunnel conductance and capacitance measures yield a peak every time the number of electrons in the QD increases by one.…”

Section: Introductionmentioning

confidence: 99%

Mixed correlation phases in elongated quantum dots

et al. 2010

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It is theoretically shown, within the local spin-density-functional theory framework, that inhomogeneous confining potentials in elongated, diluted N-electron quantum dots may lead to the formation of mixed phases in which some regions of the N-electron system behave like a Fermi liquid while, simultaneously, other, more dilute regions display quasiclassical Wigner crystallization. The characterization of the mixed phases in the addition energy spectrum and the infrared response is reported. An infrared sensor of electron filling is suggested.

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From quantum dots to quantum wires: Electronic structure of semiconductor nanorods

Cited by 22 publications

References 28 publications

Hole Subband Mixing and Polarization of Luminescence from Quantum Dashes: A Simple Model

Hole Subband Mixing and Polarization of Luminescence from Quantum Dashes: A Simple Model

Dielectric confinement in quantum dots of arbitrary shape within the local spin density approximation: Diluted regimes in elongated quantum dots

Mixed correlation phases in elongated quantum dots

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