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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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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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Relativistic Mott transition in twisted WSe2 tetralayers.

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Area of Science:

  • Condensed matter physics
  • Quantum electrodynamics
  • Materials science

Background:

  • Graphene's low-energy excitations are two-dimensional massless Dirac fermions.
  • Electron-electron interactions could induce a relativistic Mott transition, giving Dirac fermions mass.
  • This transition has been unobserved in pristine graphene due to insufficient interaction strength.

Purpose of the Study:

  • To realize strongly correlated artificial graphene.
  • To observe the relativistic Mott transition in a tunable system.
  • To study the behavior of Dirac fermions under strong interactions.

Main Methods:

  • Fabrication of twisted WSe2 tetralayers to create artificial graphene.
  • Magnetotransport measurements to probe electronic properties.
  • Tuning interaction strength by varying the twist angle.

Main Results:

  • The artificial graphene's band structure mimics low-energy graphene.
  • Observed hallmarks of massless Dirac fermions, including a π Berry phase and anomalous Landau fan.
  • Demonstrated a semimetal-to-insulator transition by tuning the twist angle, indicating a Mott insulating state.

Conclusions:

  • Successfully realized strongly correlated artificial graphene.
  • Observed the relativistic Mott transition in this system.
  • Opened new avenues for studying strongly correlated Dirac fermions in condensed matter.