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Related Concept Videos

Properties of Transition Metals02:58

Properties of Transition Metals

30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.1K
Phase Transitions02:31

Phase Transitions

23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Bonding in Metals02:32

Bonding in Metals

53.0K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
53.0K
Metallic Solids02:37

Metallic Solids

21.0K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.0K
Alkali Metals03:06

Alkali Metals

25.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
25.0K

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Double-Weyl Phonons in Transition-Metal Monosilicides.

Tiantian Zhang1,2, Zhida Song1,2, A Alexandradinata3

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Researchers discovered novel topological phonons in MSi materials (M=Fe, Co, Mn, Re, Ru). These crystalline materials exhibit unique spin-1 Weyl and charge-2 Dirac points, paving the way for new phononic topological materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Topological phonons are exotic quasiparticles with unique properties.
  • Weyl and Dirac points are fundamental topological features in condensed matter systems.

Purpose of the Study:

  • To identify crystalline materials exhibiting double-Weyl points in phonon spectra.
  • To explore novel topological phonon features in MSi compounds.

Main Methods:

  • Utilizing ab initio calculations to investigate phonon spectra.
  • Analyzing Brillouin zone features for topological point identification.

Main Results:

  • Identified MSi (M=Fe, Co, Mn, Re, Ru) materials with double-Weyl points in acoustic and optical phonon spectra.
  • Discovered novel spin-1 Weyl points at the Brillouin zone center and charge-2 Dirac points at the zone corner.
  • Characterized gapless surface phonon dispersions as two helicoidal sheets with unique isofrequency contours.

Conclusions:

  • MSi materials host unique topological phonon states.
  • The identified topological points and surface states offer new avenues for phononic topological material design.