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Related Concept Videos

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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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
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Coulomb's Law01:30

Coulomb's Law

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Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved.
Newton's third law applies to the Coulomb force — the...
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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  9. Surface Properties Of Condensed Matter
  11. Quark Mass Dependence Of Heavy Quark Diffusion Coefficient From Lattice Qcd.
  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Condensed Matter Physics
  9. Surface Properties Of Condensed Matter
  11. Quark Mass Dependence Of Heavy Quark Diffusion Coefficient From Lattice Qcd.

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Quantifying Cytoskeleton Dynamics Using Differential Dynamic Microscopy
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Quark Mass Dependence of Heavy Quark Diffusion Coefficient from Lattice QCD.

Luis Altenkort1, David de la Cruz2, Olaf Kaczmarek1

  • 1Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany.

Physical Review Letters
|February 16, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

This study explores heavy quark diffusion using lattice quantum chromodynamics (QCD). Results show that charm and bottom quark diffusion coefficients are lower than predicted by models for open heavy flavor hadrons.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Hadron Physics

Background:

  • Understanding the behavior of heavy quarks in the quark-gluon plasma is crucial for interpreting experimental data from heavy-ion collisions.
  • Existing phenomenological models provide insights into heavy quark dynamics but require validation from first-principles calculations.

Purpose of the Study:

  • To investigate the mass dependence of heavy quark transport coefficients.
  • To provide lattice QCD calculations of heavy quark momentum and spatial diffusion coefficients.
  • To compare lattice QCD results with predictions from phenomenological models.

Main Methods:

  • Utilizing lattice quantum chromodynamics (QCD) simulations.
  • Employing light dynamical quarks with a pion mass of 320 MeV.
  • Calculating spatial diffusion coefficients for charm and bottom quarks at temperatures between 195 MeV and 293 MeV.

    • Main Results:

    • The first study of quark mass dependence for heavy quark transport coefficients using lattice QCD.
    • Spatial diffusion coefficients for charm and bottom quarks were found to be smaller than those predicted by phenomenological models.
    • Discrepancies observed between lattice QCD and phenomenological model predictions for open heavy flavor hadron properties.

    Conclusions:

    • Lattice QCD calculations offer a first-principles approach to constrain heavy quark transport properties.
    • The findings suggest a need for refinement of phenomenological models describing heavy quark behavior in the quark-gluon plasma.
    • This study provides essential data for understanding heavy quark dynamics in extreme conditions.