Engineering the hole confinement for CdTe-based quantum dot molecules

Kłopotowski, Ł.; Wojnar, P.; Kret, S.; Parlińska-Wojtan, Magdalena; Fronc, K.; Wójtowicz, T.; Karczewski, G.

doi:10.1063/1.4922044

Cited by 2 publications

(2 citation statements)

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“…The anticrossig was observed experimentally and reported, e.g., by Ardelt et al and Krenner et al for self‐assembled InGaAs molecule for the electron tunnelling resonance. The avoided level crossing for CdTe‐based quantum dot molecules was reported by Kłopotowski et al…”

Section: Resultsmentioning

confidence: 57%

“…The mixing of exciton states controlled by the electric field was analyzed by Ortner et al in the case of two dots separated by relatively narrow barrier. The quantum confinement in CdTe quantum dot molecules was investigated by Kłopotowski et al The authors indicate on the possibility to engineer the quantum confinement by using materials with a different lattice constant for the growth of the barriers. They observed the anticrossings and switching between intensities in bias dependent PL spectra.…”

Section: Introductionmentioning

confidence: 99%

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Excitonic States and Photoluminescence Spectra of a Quantum Dot Molecule Exposed to the External Static Electric Field

Schillak

2018

Physica Status Solidi (b)

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The influence of a static electric field on the energy levels, wave functions, and optical properties of excitons in a quantum dot molecule is analyzed. Taking into account the cylindrical symmetry of the molecule, the wave functions and excitonic energies are calculated when the external constant electric field is applied along the symmetry axis. Two dots separated by a narrow barrier are considered as one system of three‐dimensional potential wells for an electron and a hole. The six‐dimensional Schrödinger equation is transformed into the equivalent eigenvalue problem given by the system of the coupled two‐dimensional second order differential equations as the separation of the relative‐ and center‐of‐mass motion of an electron and a hole is not possible in this case. The differential equations are solved numerically using finite differences method. Having the eigenfunctions and eigenvalues, the excitonic photoluminescence intensity is calculated and analyzed. As an example, the configuration indicating on the possibility of non‐monotonic behavior of the photoluminescence intensity versus electric field is discussed. The comparison of numerical results with experimental data for the GaInAs quantum dot molecule is presented. Satisfactory agreement with the available experimental data is obtained.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Excitonic States and Photoluminescence Spectra of a Quantum Dot Molecule Exposed to the External Static Electric Field

Schillak

2018

Physica Status Solidi (b)

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Optical signatures of spin-dependent coupling in semimagnetic quantum dot molecules

et al. 2015

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We present photoluminescence studies of CdTe and Cd1−xMnxTe quantum dots grown in two adjacent layers. We show that when the dots are 8 nm apart, their magnetooptical properties -Zeeman shifts and transition linewidths -are analogous to those of individual CdTe or Cd1−xMnxTe dots. When the dots are grown closer, at a distance of 4 nm, it becomes possible to tune the electron states to resonance and obtain a formation of a molecular state hybridized over the two dots. As a result of the resonant enhancement of the electron-Mn ion exchange interaction, spectroscopic signatures specific to spin-dependent inter-dot coupling appear. Namely, an anomalous increase of the Zeeman shift and a resonant increase in the transition linewidth are observed. A simple model calculation allows us to quantitatively reproduce the experimental results.

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Engineering the hole confinement for CdTe-based quantum dot molecules

Cited by 2 publications

References 52 publications

Excitonic States and Photoluminescence Spectra of a Quantum Dot Molecule Exposed to the External Static Electric Field

Excitonic States and Photoluminescence Spectra of a Quantum Dot Molecule Exposed to the External Static Electric Field

Optical signatures of spin-dependent coupling in semimagnetic quantum dot molecules

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