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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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The Pauli Exclusion Principle03:06

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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.3K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Related Experiment Video

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Quantum spin Hall state in monolayer 1T'-TMDCs.

Zhuojun Li1,2, Yekai Song1,2,3, Shujie Tang1,2

  • 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 4, 2020
PubMed
Summary

Monolayer 1T' phase transition metal dichalcogenides (TMDCs) are rare but exhibit unique quantum spin Hall (QSH) states. This review covers their fabrication and QSH insulator properties, vital for 2D materials research.

Keywords:
1T′-TMDCmonolayerquantum spin Hall insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • The 1T' phase in transition metal dichalcogenides (TMDCs) is uncommon but shows promise for superconductivity and topological phases.
  • Monolayer 1T'-TMDCs possess a unique van der Waals structure, enabling novel vertical heterostructures and advanced applications.
  • These materials are increasingly recognized as key quantum spin Hall (QSH) insulators.

Purpose of the Study:

  • To review recent advancements in the fabrication of monolayer 1T'-TMDCs.
  • To present evidence supporting the quantum spin Hall (QSH) insulator nature of these materials.
  • To highlight the significance of 1T'-TMDCs in fundamental research and technological applications.

Main Methods:

  • Literature review of fabrication techniques for monolayer 1T'-TMDCs.
  • Analysis of experimental and theoretical evidence for QSH states in these materials.
  • Discussion of the structural and electronic properties contributing to QSH behavior.

Main Results:

  • Successful fabrication methods for monolayer 1T'-TMDCs have been developed.
  • Strong evidence confirms the quantum spin Hall (QSH) insulator properties.
  • The van der Waals structure is crucial for their unique electronic behavior and heterostructure integration.

Conclusions:

  • Monolayer 1T'-TMDCs are established as important quantum spin Hall (QSH) insulators.
  • Their unique properties stem from the 1T' phase and van der Waals structure.
  • Continued research promises significant advancements in fundamental science and device applications.