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Related Concept Videos

The Hall Effect01:30

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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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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure.

Anyuan Gao1, Yu-Fei Liu1,2, Jian-Xiang Qiu1

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|June 15, 2023
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Summary
This summary is machine-generated.

Researchers observed a novel nonlinear Hall effect driven by quantum metric dipole in MnBi2Te4 and black phosphorus. This quantum metric nonlinear Hall effect is controllable by antiferromagnetic spins, opening new avenues for spintronics.

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Area of Science:

  • Condensed-matter physics
  • Quantum geometry
  • Spintronics

Background:

  • Quantum geometry comprises quantum metric and Berry curvature.
  • Berry curvature effects are well-studied (e.g., quantum Hall effect, anomalous Hall effect).
  • Quantum metric effects remain largely unexplored.

Purpose of the Study:

  • To investigate and report a nonlinear Hall effect induced by the quantum metric dipole.
  • To explore the potential of interfacing magnetic topological materials with 2D materials.

Main Methods:

  • Interfacing even-layered MnBi2Te4 with black phosphorus.
  • Investigating nonlinear transport properties.
  • Analyzing the dependence of the Hall effect on antiferromagnetic (AFM) spin orientation.

Main Results:

  • Observed a quantum metric nonlinear Hall effect.
  • Demonstrated that the effect's direction reverses with AFM spin reversal.
  • Showcased scattering-time-independent scaling of the quantum metric nonlinear Hall effect.

Conclusions:

  • The study reveals a new quantum metric response, the quantum metric nonlinear Hall effect.
  • This finding validates theoretical predictions for quantum metric phenomena.
  • Paves the way for novel applications combining nonlinear electronics and antiferromagnetic spintronics.