Semiconductor fridges get into shape
Jun 5, 2001
Magnetoresistance is the change in the electrical resistance of a material when it is put in a magnetic field. Condensed-matter physicists have long known that the magnetoresistance of a device is made up of a physical contribution that depends on its intrinsic properties, such as carrier concentration and mobility, and a geometric contribution that depends on its shape, and on the size and location of the electrical contacts. Usually the physical magnetoresistance dominates, but our group at NEC has recently shown that the geometric effects can give rise to an unusually large or "extraordinary" magnetoresistance in inhomogenous non-magnetic structures formed from gold and a semiconductor, such as indium antimonide.
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