2000 character limit reached
Quantization of the higher Berry curvature and the higher Thouless pump
Published 10 May 2023 in math-ph, cond-mat.str-el, hep-th, and math.MP | (2305.06399v2)
Abstract: We show that for families of 1d lattice systems in an invertible phase, the cohomology class of the higher Berry curvature can be refined to an integral degree-3 class on the parameter space. Similarly, for families of U(1)-invariant 2d lattice systems in an invertible phase, the higher Thouless pump can be refined to an integral degree-2 class on the parameter space. We show that the 2d Thouless pump can be identified with an excess Berry curvature of a flux insertion.
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