= P. A. Wolff
{c}
{tag=Physicist}
A theoretical <condensed matter physicist> who coauthored the <Schrieffer-Wolff transformation> with <John Robert Schrieffer>. Their <canonical transformation> relates a model with fluctuating impurity charge to an effective model of <spin> exchange in the weak-mixing limit. This explains how virtual charge processes can produce the low-<energy> physics associated with the <Kondo effect>.<Relation between the Anderson and Kondo Hamiltonians by John Robert Schrieffer and P. A. Wolff>[Abstract: canonical transformation and equivalence in the small-mixing limit]{ref}
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