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Related Concept Videos

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Fermi Level

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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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.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Updated: Jan 5, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Hourglass Fermion in Two-Dimensional Material.

Z F Wang1, Bing Liu1, Wei Zhu2

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Physical Review Letters
|October 22, 2019
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Summary
This summary is machine-generated.

Researchers discovered hourglass fermions in 2D materials using glide mirror symmetry. This exotic quasiparticle exhibits unique spin properties and a giant spin Hall conductivity, paving the way for new electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Hourglass fermions are exotic quasiparticles protected by nonsymmorphic symmetry.
  • Their study in two-dimensional (2D) solid-state materials remains underexplored.

Purpose of the Study:

  • To propose and realize a 2D material hosting hourglass fermions.
  • To investigate the properties and potential applications of these fermions.

Main Methods:

  • Theoretical proposal of a 2D rectangular lattice with p orbitals and glide mirror symmetry.
  • Inclusion of Rashba spin-orbital coupling to split Dirac nodal lines.
  • First-principles calculations to predict a specific material realization.

Main Results:

  • A 2D rectangular lattice with glide mirror symmetry hosts hourglass fermions.
  • The material Bi/Cl-SiC(111) is predicted to realize these fermions with a large bandwidth.
  • Observed spin-momentum locking and giant spin Hall conductivity.

Conclusions:

  • A general strategy for designing 2D hourglass fermions is established.
  • The findings open avenues for exploring novel topological phenomena in 2D materials.
  • Potential for applications in spintronics due to unique spin textures and conductivity.