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<p>When a heterojunction is formed by two different <a href="page.php?w=semiconductor">semiconductor</a>s, a <a href="page.php?w=quantum_well">quantum well</a> can be fabricated due to difference in <a href="page.php?w=band_structure">band structure</a>. In order to calculate the static <a href="page.php?w=energy_level">energy level</a>s within the achieved quantum well, understanding variation or mismatch of the <a href="page.php?w=Effective_mass_%28solid-state_physics%29">effective mass</a> across the heterojunction becomes substantial. The quantum</p><p>
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