Y.-X. Zhao

Complete Topological Classification with P and T Symmetries: Revealing a Topological Invariant Invisible to K-Theory

The K-theoretic framework provides a complete topological classification of the tenfold symmetry classes and has been generalized to incorporate crystalline symmetries. Here, we show that this classification is incomplete even in the elementary case of spinless systems possessing both P and T symmetries. We obtain the...