For C2T/PT-symmetric Bloch bundles, rank two with nonzero Euler class has no exponentially localized symmetric Wannier basis, while every rank not equal to two does.
Wannier decay and the Thouless conjecture
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abstract
Non-trivial Chern classes pose an obstruction to the existence of exponentially decaying Wannier functions which provide natural bases for spectral subspaces. For non-trivial Bloch bundles, we obtain decay rates of Wannier functions in dimensions $d=2,3$. For $d=2$, we construct Wannier functions with full asymptotics and optimal decay rate $\mathcal{O}(|x|^{-2})$ as conjectured by Thouless; for $d=3$, we construct Wannier functions with the uniform decay rate $\mathcal{O}(|x|^{-7/3})$.
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Fragile topology on solid grounds: a mathematical perspective
For C2T/PT-symmetric Bloch bundles, rank two with nonzero Euler class has no exponentially localized symmetric Wannier basis, while every rank not equal to two does.