Metric graph Laplacians produce families of Hamiltonians with changing topology that exhibit non-trivial Berry phase despite real eigenfunctions.
3, 295–309, DOI 10.7494/Op- Math.2010.30.3.295
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Berry's phase under topology change
Metric graph Laplacians produce families of Hamiltonians with changing topology that exhibit non-trivial Berry phase despite real eigenfunctions.