Hall Effect

Hall effect

A current-carrying body placed in a magnetic field with the current direction unaligned with the field experiences a force leading to a transient sidewise drift of the charge carriers of the current. This drift continues until the force is balanced by an electric field produced by the charge accumulating at points on the body's surface in the direction of the drift. At points on the body's surface opposite the direction of the drift, there will clearly be an equal depletion of charge, which is equivalent to an accumulation of charge of opposite sign. The electric field created by this transient behavior is called the Hall field and results in a potential difference between corresponding points on the two oppositely charged surfaces. Which

of the two surfaces is at the higher potential is determined by the sign of the charge carriers. If the carriers are positive, the surface in the direction of their drift will be at the higher potential; if the carriers are negative, the surface in the direction of their drift will be at the lower potential. The phenomenon thus described is called the Hall effect after E. H. Hall, who discovered it in 1879. A little over a century later, it was discovered by Klaus von Klitzingthat the Hall potential in a semiconducting material experiences quantum jumps as the magnetic field is increased when subjected to temperatures far below room temperature. This remarkable discovery has made it possible to measure an important constant of physics, called the fine structure constant, to a heretofore unattainable accuracy. Also, it provides scientists with a readily achieved standard for making accurate determinations of conductivity. For this discovery, von Klitzing was awarded the Nobel prize in 1985.

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Hall effect

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Hall effect

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Hall effect

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Hall effect

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