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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
Van der Waals Equation01:10

Van der Waals Equation

The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
Valence Bond Theory02:42

Valence Bond Theory

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...
Bonding in Metals02:32

Bonding in Metals

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”.
Metallic Solids02:37

Metallic Solids

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. Many...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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Updated: Jul 7, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
09:25

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Two-Dimensional van der Waals Polar Metal MoOBr2.

Xuzhou Sun1, Fengfeng Ye2, Yuqiang Fang1

  • 1Key Laboratory of Intelligent Creation for Extreme Energy Materials of Ministry of Education, School of Materials Science and Engineering and Zhang Jiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of the American Chemical Society
|July 6, 2026
PubMed
Summary
This summary is machine-generated.

We discovered MoOBr2, the first 2D van der Waals polar metal. This material exhibits metallic conductivity and broken spatial inversion symmetry, paving the way for advanced electronic and optical devices.

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Area of Science:

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

Background:

  • Two-dimensional (2D) van der Waals (vdW) polar metals are rare due to strong electron screening that destabilizes polar order.
  • These materials are sought after for unique properties like non-reciprocal charge transport and nonlinear optical effects.

Purpose of the Study:

  • To report the discovery of a novel 2D vdW polar metal.
  • To characterize its structural, electronic, and physical properties.
  • To explore its potential applications in next-generation devices.

Main Methods:

  • Single-crystal X-ray diffraction and atomic-resolution scanning transmission electron microscopy for structural analysis.
  • Angle-resolved photoemission spectroscopy and electrical transport measurements for electronic properties.
  • Second-harmonic generation and nonlinear electrical transport measurements to confirm broken inversion symmetry.

Main Results:

  • Discovery of MoOBr2, the first 2D vdW polar metal composed of polar atomic layers.
  • Crystallization in space group C2 with polarity from distorted [MoO2Br4] octahedra.
  • Confirmed metallic behavior (resistivity 5.13 × 10⁻⁵ Ω m, carrier concentration 1.34 × 10²⁰ cm⁻³).
  • Demonstrated broken spatial inversion symmetry via nonlinear optical and electrical transport measurements.
  • Observed high thermal conductivity (219 W m⁻¹ K⁻¹).

Conclusions:

  • MoOBr2 is the first intrinsic 2D vdW polar metal, exhibiting metallic conductivity and polar order.
  • Its unique properties, including broken inversion symmetry and high thermal conductivity, make it promising for spintronic and nonlinear optoelectronic applications.
  • Presents a new chemical design strategy for discovering novel polar metals.