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The Hall Effect01:30

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Linear and nonlinear inequalities are fundamental for analyzing variable relationships and identifying ranges satisfying specific conditions. A linear inequality involves variables raised only to the first power, resulting in a straight-line graph. This line partitions the coordinate plane into two distinct regions: one that satisfies the inequality and one that does not. Each region represents a set of solutions where the linear relationship holds true under the specified constraint.Nonlinear...
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Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
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Nonlinear anomalous Hall effect in few-layer WTe2.

Kaifei Kang1, Tingxin Li1, Egon Sohn2,3

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.

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|February 27, 2019
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Summary
This summary is machine-generated.

Researchers discovered a nonlinear anomalous Hall effect (AHE) in a non-magnetic material without a magnetic field. This novel finding in Td-WTe2 opens new avenues for spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The Hall effect traditionally requires broken time-reversal symmetry, achieved via external magnetic fields or magnetic materials.
  • The anomalous Hall effect (AHE) is a phenomenon observed in magnetic materials, where a transverse voltage arises due to spin-orbit interactions.
  • Non-magnetic materials typically do not exhibit AHE under zero magnetic field conditions.

Purpose of the Study:

  • To investigate the possibility of observing a nonlinear anomalous Hall effect (AHE) in a non-magnetic material.
  • To explore the characteristics and underlying mechanisms of this nonlinear AHE in few-layer Td-WTe2.
  • To demonstrate a novel approach to generating Hall effects without external magnetic fields.

Main Methods:

  • Utilized few-layer Td-WTe2, a 2D semimetal with broken inversion symmetry.
  • Performed angle-resolved electrical transport measurements under varying bias currents.
  • Analyzed the temperature dependence of Hall conductivity to elucidate contributing factors.

Main Results:

  • Observed a nonlinear AHE where Hall voltage depends quadratically on the longitudinal current in non-magnetic Td-WTe2.
  • Demonstrated that the Hall voltage is maximized when current is perpendicular to the material's mirror line and vanishes when parallel.
  • Showed that the bias current induces an out-of-plane magnetization, driving the observed AHE.

Conclusions:

  • A nonlinear AHE can be achieved in non-magnetic materials like Td-WTe2 by breaking inversion symmetry and utilizing current-induced magnetization.
  • Both intrinsic Berry curvature dipole and extrinsic spin-dependent scattering mechanisms contribute to the observed nonlinear AHE.
  • This discovery offers a new pathway for developing magnetic-free spintronic devices and sensors.