Drude's classical model was augmented by Felix Bloch, Arnold Sommerfeld, and independently by Wolfgang Pauli, who used quantum mechanics to describe the motion of a quantum electron in a periodic lattice.
Drude's classical model was augmented by Felix Bloch, and independently by Wolfgang Pauli. Felix Bloch was Arnold Sommerfeld. Wolfgang Pauli used quantum mechanics. This was to describe the motion of a quantum electron in a periodic lattice.