Abstract

In many applications, topological effects can be characterized by a quantized topological invariant [1]. In this work, we investigate a new type of topological insulator that stands apart from this formalism, since it exhibits spectral bands with non-quantized topological properties. As it turns out, this system can nevertheless be reconciled with the existing paradigm, since a quantization can be established by squaring the Hamiltonian Fig. 1(b).

© 2019 IEEE

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