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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

48.7K
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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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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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Bewley Lattice Diagram01:12

Bewley Lattice Diagram

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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
606
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

11.2K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Quantum engineered Kondo lattices.

Jeremy Figgins1, Laila S Mattos2,3, Warren Mar2,4

  • 1Department of Physics, University of Illinois at Chicago, Chicago, IL, 60607, USA.

Nature Communications
|December 8, 2019
PubMed
Summary
This summary is machine-generated.

Scientists engineered nanoscale Kondo lattices, or "Kondo droplets," to study quantum materials. Changing droplet geometry controlled their properties and revealed a new quantum phenomenon, the Kondo echo, offering insights into quantum correlations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Nanotechnology

Background:

  • Atomic manipulation enables bottom-up investigation of strongly correlated electron materials.
  • Engineering artificial nanoscale systems allows exploration of emergent quantum many-body effects.
  • Kondo lattices and heavy-fermion materials exhibit complex quantum phases.

Purpose of the Study:

  • To quantum engineer nanoscale Kondo lattices (Kondo droplets) as replicas of heavy-fermion materials.
  • To investigate the effect of real-space geometry on droplet properties and quantum coherence.
  • To discover and characterize new quantum phenomena in engineered nanostructures.

Main Methods:

  • Theoretical modeling and experimental atomic manipulation techniques.
  • Fabrication and characterization of nanoscale Kondo droplets with tailored geometries.
  • Measurement of Kondo temperature and investigation of quantum correlations.

Main Results:

  • Coherently coupled Kondo droplets were created, approaching quantum-coherent Kondo lattice properties.
  • Real-space geometry tuning significantly altered droplet Kondo temperature.
  • Discovery of the 'Kondo echo' phenomenon, probing spatially extended Kondo cloud correlations.

Conclusions:

  • Nanoscale Kondo droplets serve as versatile platforms for quantum engineering of heavy-fermion physics.
  • Geometric control offers a powerful knob to tune quantum properties and coherence in nanostructures.
  • The Kondo echo provides a novel signature for exploring quantum entanglement and correlations.