![]() ![]() In particular, Thomas–Fermi screening is the limit of the Lindhard formula when the wavevector (the reciprocal of the length-scale of interest) is much smaller than the Fermi wavevector, i.e. Thomas–Fermi screening can be derived as a special case of the more general Lindhard formula. It is based on quantum mechanics (first-order perturbation theory) and the random phase approximation. Lindhard theory, named after Danish professor Jens Lindhard, is a method of calculating the effects of electric field screening by electrons in a solid.
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