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Periodic Systems in Different Dimensions (5 minutes)

  • Periodic systems can take form in all three spatial dimensions:
  • 3-D periodic system example: Unit cells of NaCl.
  • 2-D periodic system example: Hexagonal units in graphene.
  • 1-D periodic system example: String of beads connected by springs
  • In real physical cases, the systems always physically exist 3-Dimensionally; however, the dimensionality of the periodicity is all that concerns us now.

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