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An analytical theory of intervalley mixing at semiconductor heterojunctions is presented. Burt’s envelope-function representation is used to analyze a pseudopotential Hamiltonian, yielding a simple d-function mixing betweenG and X electrons and light and heavy holes. This coupling exists even for media differing only by a constant band offset (i.e., with no difference in Bloch functions). [S0031-9007(98)06534-X]

Analytical Envelope-Function Theory of Interface Band Mixing