Quasi-one Dimensional Topological Insulator:Mbius Molecular Devices in Peierls Transition

摘要

We show that,assisted by the Peierls transition of lattice,as a quasi-one dimensional(Q1D) tight binding system,a M¨obius molecular device can behave as a simple topological insulator.With the Peierls phase transition to form a domain wall,the solitonary zero modes exist as the ground state of this electron-phonon hybrid system,which is protected by the Z_2 topology of the M¨obius strip.The robustness of the ground state prevents these degenerate zero modes from their energy spectrum splitting caused by any perturbation.