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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/ii/paper-4/34b/d/solution

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Past exam of the mathematics course of the University of Cambridge / 2021 / ii / Paper 4 / 34B / d / Solution by

Codex  0 Created 2026-09-24 Updated 2026-09-25

Filled bands separated by gaps explain the distinction between electrical insulators and conductors: a completely filled band cannot change its net crystal momentum under a weak field, whereas a partially filled band supports current.

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