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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

Magnetic Fields

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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.
A magnetic field is defined by the force that a charged particle experiences...
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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Lenz's Law01:15

Lenz's Law

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The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Magnus Hall Effect.

Michał Papaj1, Liang Fu1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

A novel linear response Hall effect is predicted in time-reversal-invariant systems. This quantum Magnus effect generates transverse velocity from electric fields, measuring Berry curvature distribution.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Solid-state physics

Background:

  • The Hall effect traditionally requires magnetic fields.
  • Time-reversal-invariant systems are crucial in condensed matter.
  • Understanding electron dynamics under electric fields is key.

Purpose of the Study:

  • To predict a new type of Hall effect.
  • To investigate the role of the quantum Magnus effect.
  • To link Hall conductance to Berry curvature in specific systems.

Main Methods:

  • Theoretical prediction of a linear response Hall effect.
  • Analysis of quantum Magnus effect in Bloch electron wave packets.
  • Ballistic transport calculations.

Main Results:

  • A novel Hall effect is predicted in systems with built-in electric fields and zero magnetic field.
  • The quantum Magnus effect drives anomalous transverse velocity.
  • Magnus Hall conductance quantifies Berry curvature distribution on the Fermi surface in the ballistic limit.

Conclusions:

  • The study reveals a new Hall effect mechanism.
  • The quantum Magnus effect offers a pathway to probe Berry curvature.
  • This finding has implications for spintronics and topological materials.