Vibronic Ground-State Degeneracies and the Berry Phase: A Continuous Symmetry Perspective.

  title={Vibronic Ground-State Degeneracies and the Berry Phase: A Continuous Symmetry Perspective.},
  author={Raphael F. Ribeiro and Joel Yuen-Zhou},
  journal={The journal of physical chemistry letters},
  volume={9 1},
We develop a geometric construction to prove the inevitability of the electronic ground-state (adiabatic) Berry phase for a class of Jahn-Teller (JT) models with maximal continuous symmetries and N > 2 intersecting electronic states. Given that vibronic ground-state degeneracy in JT models may be seen as a consequence of the electronic Berry phase and that any JT problem may be obtained from the subset that we investigate in this Letter by symmetry-breaking, our arguments reveal the fundamental… Expand

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