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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Velocity and Position by Integral Method01:13

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If acceleration as a function of time is known, then velocity and position functions can be derived using integral calculus. For constant acceleration, the integral equations refer to the first and second kinematic equations for velocity and position functions, respectively.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Types of Stressors01:23

Types of Stressors

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A stressor is any event, condition, or stimulus that triggers stress and causes a physical or psychological response in the body. Stressors can be categorized into three main types: catastrophes; significant life changes; and daily hassles, including social stress. Each can be detrimental to physical and mental well-being.
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What is Variation?01:14

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
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Updated: Jan 27, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Buried Stressor Engineering for Position-Controlled InGaAs Quantum Dots with Local Density Variation for Integrated

Martin Podhorský1, Maximilian Klonz1, Lux Böhmer1

  • 1Institut für Physik Und Astronomie, Technische Universität Berlin, Hardenbergstraße 36, Berlin D-10623, Germany.

ACS Photonics
|January 26, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a method for precisely controlling the placement and density of Indium Gallium Arsenide (InGaAs) quantum dots. This breakthrough enables the creation of integrated photonic chips for advanced quantum technologies.

Keywords:
configuration interaction methodcontinuum elasticity theoryk·p methodphotonic quantum technologiesquantum communicationsite-controlled quantum dotssurface strain engineering

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Nanotechnology

Background:

  • Site-controlled quantum dots are crucial for scalable quantum photonic applications.
  • Existing methods for quantum dot fabrication often lack precision in placement and density control.

Purpose of the Study:

  • To demonstrate a monolithic, two-step epitaxial growth technique for site-controlled InGaAs quantum dots using a buried-stressor method.
  • To achieve local variation in quantum dot density with high fabrication accuracy.

Main Methods:

  • Utilized a buried-stressor method for site-controlled epitaxy of InGaAs quantum dots.
  • Employed microphotoluminescence and cathodoluminescence for characterization.
  • Performed theoretical calculations to understand stressor aperture effects.

Main Results:

  • Achieved low lateral displacements (17 - 17 + 19 nm) of apertures from mesa centers.
  • Demonstrated reproducible nucleation of low- and high-density quantum dots within a single growth step.
  • Validated the effect of stressor aperture on quantum dot properties via theoretical calculations.

Conclusions:

  • The buried-stressor method offers high precision for fabricating site-controlled quantum dots.
  • This technique enables the integration of varying quantum dot densities on a single chip.
  • Paves the way for advanced photonic quantum technology modules, including single-photon sources and microlasers.