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<p>For example, as an <a href="page.php?w=electron">electron</a> travels through a <a href="page.php?w=semiconductor">semiconductor</a>, its motion is disturbed in a complex way by its interactions with other electrons and with <a href="page.php?w=atomic_nucleus">atomic nuclei</a>. The electron behaves as though it has a different <a href="page.php?w=effective_mass_%28solid-state_physics%29">effective mass</a> travelling unperturbed in vacuum. Such an electron is called an electron quasiparticle. In another example, the aggregate motion of electrons</p><p>
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