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Related Concept Videos

Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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Semiconductors01:22

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Superconductor01:24

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Superconductivity in Empty Bands and Multiple Order Parameter Chirality.

Robert Joynt1,2, Wen-Chin Wu3

  • 1Department of Physics, University of Wisconsin-Madison, Madison, WI, 53706, USA. rjjoynt@wisc.edu.

Scientific Reports
|October 13, 2017
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Summary
This summary is machine-generated.

Scientists discovered a superconducting order parameter in unoccupied electronic bands, explaining light polarization changes in superconductors. This finding reveals broken time reversal symmetry and opens new avenues for topological superconductivity research.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Experiments show light polarization rotation upon reflection from superconductors.
  • Photon energy exceeding electronic bandwidth suggests roles for filled or empty bands.

Purpose of the Study:

  • To explain the observed light polarization rotation in superconductors.
  • To investigate the role of Coulomb interactions and order parameters in unoccupied bands.

Main Methods:

  • Utilizing strong-coupling theory to model Coulomb interactions.
  • Analyzing the implications of experimental observations on the order parameter's form.

Main Results:

  • A Coulomb interaction can generate an order parameter in unoccupied bands, explaining experimental results.
  • The study proposes the first detection of a superconducting order parameter in a band far from the Fermi energy.
  • A positive Kerr effect indicates broken time reversal and mirror symmetries in the ordered phase.

Conclusions:

  • The findings provide tight constraints on the order parameter's form across different bands.
  • Experiments may have detected a superconducting order parameter in a previously inaccessible band.
  • Analysis suggests different order parameter chiralities in UPt3, hinting at complex topological superconductivity.