Interacting topological mirror excitonic insulator in one dimension

TL;DR

This paper introduces a new one-dimensional topological phase called the topological mirror excitonic insulator, characterized by quantized polarization and boundary modes, with potential realization in nanowire systems.

Contribution

It proposes a novel topological phase driven by exciton physics protected by mirror symmetry, supported by bosonization analysis and potential experimental platforms.

Findings

Quantized bulk polarization and boundary half-charge modes.

Robustness against strong correlation effects demonstrated.

Potential realization in Rashba and Dirac semimetal nanowires.

Abstract

We introduce the topological mirror excitonic insulator as a new type of interacting topological crystalline phase in one dimension. Its mirror-symmetry-protected topological properties are driven by exciton physics, and it manifests in the quantized bulk polarization and half-charge modes on the boundary. And the bosonization analysis is performed to demonstrate its robustness against strong correlation effects in one dimension. Besides, we also show that Rashba nanowires and Dirac semimetal nanowires could provide ideal experimental platforms to realize this new topological mirror excitonic insulating state. Its experimental consequences, such as quantized tunneling conductance in the tunneling measurement, are also discussed.