Robust basis-independent real-space topological invariants for TCPs are constructed via projected symmetry operators, with markers exponentially localized at symmetry fixed points and protected from distant impurities.
The Pauli matrices τa act on the Nambu degree of freedom
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Robust topological invariants of topological crystalline phases in the presence of impurities
Robust basis-independent real-space topological invariants for TCPs are constructed via projected symmetry operators, with markers exponentially localized at symmetry fixed points and protected from distant impurities.