Etymology

umklapp

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Today it means: Pertaining to the transformation of a wave vector to another Brillouin zone as a result of a scattering process. Full definition →

German umklappen
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The story

  1. German · derived fromumklappen“fold over”
  2. English todayumklapp

From German umklappen (“fold over”).

Etymology from Wiktionary, CC BY-SA 4.0.