Fragility of symmetry-protected topological order on a Hubbard ladder

Article

关键词: SPIN LADDERS;    CHAINS;    PHASES;    TRANSITIONS;   

DOI  :  10.1103/PhysRevB.91.155128

来源: SCIE

【 摘 要 】

Anfuso andRosch [Phys. Rev. B 75, 144420 (2007)] showed that the topological Haldane phase in a fermionic spin-1/2 ladder can be continuously deformed into a trivial phase without explicitly breaking symmetries when local charge fluctuations are taken into account. Within the framework of symmetry-protected topological phases, we revisit the model and demonstrate how the Haldane phase can be adiabatically connected to a trivial phase due to charge fluctuations. Furthermore, we show that the Haldane phase remains stable as long as the system is symmetric under particular reflection symmetries.

【 授权许可】

Free