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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Superconductivity without phonons.

P Monthoux1, D Pines, G G Lonzarich

  • 1School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, UK.

Nature
|December 22, 2007
PubMed
Summary
This summary is machine-generated.

Superconductivity can occur without lattice vibrations (phonons), driven by electron interactions. This electronic pairing leads to unconventional superconductivity sensitive to material properties.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • The Bardeen-Cooper-Schrieffer (BCS) theory, established 50 years ago, describes superconductivity mediated by lattice vibrations (phonons).
  • Theoretical explorations have long considered superconductivity mechanisms independent of phonons.

Purpose of the Study:

  • To explore the theoretical basis and implications of superconductivity arising from electron-electron interactions, independent of phonons.
  • To investigate unconventional superconductivity driven by electronic degrees of freedom.

Main Methods:

  • Theoretical analysis of electron interactions, considering both charge and spin degrees of freedom.
  • Examination of effective interactions between electrons in the absence of phonon mediation.

Main Results:

  • A full treatment of electron charge and spin predicts attractive interactions even without phonons.
  • This phonon-free attraction can lead to electronic pairing and unconventional superconductivity.

Conclusions:

  • Superconductivity can be realized through electronic interactions, offering an alternative to traditional BCS theory.
  • Phonon-less superconductivity is highly sensitive to crystal structure and electronic/magnetic properties, suggesting new material design avenues.