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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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Magnetic Fields01:27

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Axial Hall Effect in Altermagnetic Lieb Lattices.

Xilong Xu1, Haonan Wang1, Li Yang1,2

  • 1Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130, United States.

ACS Applied Materials & Interfaces
|February 28, 2026
PubMed
Summary
This summary is machine-generated.

We predict a novel axial Hall effect in Lieb-lattice altermagnets, driven by Berry curvature and a hidden axial pseudospin. This discovery opens new avenues for spintronic applications in topological materials.

Keywords:
Dresselhaus spin–orbit couplingLieb latticealtermagnetismanomalous Hall responseaxial degree of freedomfirst-principles

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnets exhibit unique electronic and magnetic properties.
  • Berry curvature plays a crucial role in anomalous Hall effects.
  • Topological degrees of freedom offer novel functionalities.

Purpose of the Study:

  • To predict and investigate the axial Hall effect in Lieb-lattice altermagnets.
  • To identify the underlying topological mechanism, the axial pseudospin.
  • To explore the potential of this effect in material design and spintronics.

Main Methods:

  • Tight-binding model calculations.
  • First-principles density functional theory (DFT) computations.
  • Analysis of spin-orbit coupling and piezomagnetic effects.

Main Results:

  • Prediction of a Berry-curvature-driven axial Hall effect.
  • Identification of axial pseudospin as a hidden topological degree of freedom.
  • Confirmation in strained ternary transition-metal dichalcogenides (e.g., Mn2WS4).
  • Demonstration of the effect's origin from spin-orbit coupling and piezomagnetism.
  • Observation of a strain-independent, topologically robust effect.
  • Thickness-dependent modulation in multilayer structures.

Conclusions:

  • The axial Hall effect is a significant phenomenon in Lieb-lattice altermagnets.
  • Axial pseudospin is a key topological feature enabling this effect.
  • This discovery highlights the importance of spin-orbit coupling and noncollinear spin textures in altermagnets.
  • Opens new avenues for exploring intrinsic Hall phenomena and spintronic applications.