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Related Concept Videos

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Metallic Solids02:37

Metallic Solids

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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....
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Layer Hall Effect in Multiferroic Two-Dimensional Materials.

Yangyang Feng1, Ying Dai1, Baibiao Huang1

  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street 27, Jinan 250100, China.

Nano Letters
|May 26, 2023
PubMed
Summary
This summary is machine-generated.

A novel mechanism for the layer Hall effect (LHE) is proposed in multiferroic 2D materials. This effect, driven by Berry curvature and symmetry breaking, is controllable and reversible, opening new avenues for LHE research.

Keywords:
ferroelectricfirst-principleslayer Hall effectmultiferroictwo-dimensional materials

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Multiferroics

Background:

  • The layer Hall effect (LHE) is crucial but rarely observed, typically requiring persistent electric fields or sliding ferroelectricity.
  • Existing paradigms for LHE are limited in their applicability and observation.
  • Understanding new mechanisms for LHE is vital for advancing 2D materials research.

Purpose of the Study:

  • To propose a new mechanism for observing the layer Hall effect (LHE) in multiferroic 2D materials.
  • To explore the role of symmetry, time-reversal symmetry breaking, and valley physics in generating LHE.
  • To demonstrate ferroelectric control and reversibility of the predicted LHE.

Main Methods:

  • Utilized symmetry analysis and a low-energy effective model to propose the new LHE mechanism.
  • Investigated the influence of time-reversal symmetry breaking and valley physics on Bloch electrons.
  • Employed first-principles calculations to verify the mechanism in bilayer Co2CF2.

Main Results:

  • A novel mechanism for LHE is proposed by coupling layer physics with multiferroics.
  • Large Berry curvature in one valley, combined with inversion symmetry breaking, leads to layer-polarized Berry curvature.
  • The generated LHE is demonstrated to be ferroelectrically controllable and reversible.
  • First-principles calculations confirm the mechanism and phenomena in bilayer Co2CF2.

Conclusions:

  • The study presents a new mechanism for generating the layer Hall effect in multiferroic 2D materials.
  • Ferroelectric control and reversibility of LHE are demonstrated, offering practical implications.
  • This research opens new directions for LHE and 2D materials research, particularly in multiferroics.