2011

The emergence of gauge invariance: the stay-at-home gauge versus local-global duality

Zaanen, J., Beekman, A. J.

Understand

In condensed matter physics gauge symmetries other than the U(1) of electromagnetism are of an emergent nature.

  • Two emergence mechanisms for gauge symmetry are well established: the way these arise in Kramers-Wannier type local-global dualities, and as a way to encode local constraints encountered in (doped) Mott insulators.
  • We demonstrate that these gauge structures are closely related, and appear as counterparts in either the canonical or field-theoretical language.
  • The restoration of symmetry in a disorder phase transition is due to having the original local variables subjected to a coherent superposition of all possible topological defect configurations, with the effect that correlation functions are no longer well-defined.

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