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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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. Schrödinger...
Quantum Numbers02:43

Quantum Numbers

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.
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
Fermi Level Dynamics01:12

Fermi Level Dynamics

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.
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Estimation of the Physical Quantities01:05

Estimation of the Physical Quantities

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Related Experiment Videos

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials.

Paolo Giannozzi1, Stefano Baroni, Nicola Bonini

  • 1CNR-INFM Democritos National Simulation Center, 34100 Trieste, Italy. Dipartimento di Fisica, Università degli Studi di Udine, via delle Scienze 208, 33100 Udine, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 12, 2011
PubMed
Summary

QUANTUM ESPRESSO is a free, open-source software suite for materials modeling and electronic-structure calculations. It utilizes density-functional theory and is designed for efficiency on parallel architectures.

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Area of Science:

  • Computational Materials Science
  • Quantum Chemistry
  • Condensed Matter Physics

Background:

  • Electronic-structure calculations and materials modeling are crucial for scientific advancement.
  • Existing computational tools often lack flexibility or are proprietary.
  • The need for accessible, high-performance simulation software is significant.

Purpose of the Study:

  • To introduce QUANTUM ESPRESSO, an integrated, open-source software suite.
  • To provide researchers with a powerful and freely available tool for electronic-structure calculations and materials modeling.
  • To foster collaboration and innovation in the field through an open-source development model.

Main Methods:

  • Utilizes density-functional theory (DFT) as the primary theoretical framework.
  • Employs plane waves and various pseudopotential types (norm-conserving, ultrasoft, projector-augmented wave) for calculations.
  • Leverages newly-restructured, efficient electronic-structure codes optimized for massively parallel architectures.

Main Results:

  • QUANTUM ESPRESSO offers a comprehensive and integrated suite for diverse materials modeling tasks.
  • The software is freely available under the GNU General Public License, promoting widespread research access.
  • The open-source nature encourages community participation and code development.

Conclusions:

  • QUANTUM ESPRESSO is a valuable, accessible, and evolving resource for the scientific community.
  • Its focus on innovation, efficiency, and user-friendliness supports cutting-edge research in materials science.
  • The project's open-source model facilitates collaborative development and the integration of new ideas.