Archive of posts with tag “algebraic number theory”

• Nov 9, 2023

  Rotational symmetry of plane lattices as a simple example of algebraic number theory

  For a plane lattice, there is only a finite number of different rotational symmetries that are compatible with the discrete translational symmetry. For example, the 5-fold rotational symmetry is not one of them. Why is that? It turns out that whether an $m$-fold symmetry is compatible with translational symmetry is the same as whether $\varphi(m)\le2$.

  /math #complex #condensed matter physics #algebraic number theory #lattice #mathematical physics

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