Abstract
The 1/ f noise in mobility and diffusivity are discussed. The two noise densities are related due to an instantaneous Einstein relation, valid for times larger than the collision time. The Boltzmann equation treatment shows that Hooge's relation for the collective band mobility noise, S μ( f)/( μ ) 2 = α/ fN, can be justified for a nondegenerate and spatially noncorrelated electron or ion gas.
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