One-dimensional Dexter-type excitonic topological phase transition

• URL: http://arxiv.org/abs/2305.18299v4
• Date: Wed, 17 Jan 2024 18:35:04 GMT
• Title: One-dimensional Dexter-type excitonic topological phase transition
• Authors: Jianhua Zhu, Ji Chen, and Wei Wu
• Abstract summary: We have computed the Zak phase for a generic one-dimensional dimerised excitonic model. Tuning relevant hopping parameters gives rise to a rich spectrum of physics. A new concept of composite chiral site" was developed to interpret the Zak phase.
• Score: 7.233903256213042
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recently topogical excitons have attracted much attention. However, studies on the topological properties of excitons in one dimension are still rare. Here we have computed the Zak phase for a generic one-dimensional dimerised excitonic model. Tuning relevant hopping parameters gives rise to a rich spectrum of physics, including non-trivial topological phase in uniform chain unlike the conventional Su-Shcrieffer-Heeger model, topologically nontrivial flat bands, and exotic fractional phase. a new concept of ``composite chiral site" was developed to interpret the Zak phase of $\pi$ in our calculations. Our finite-chain calculations substantiate topological edge states, providing more information about their characteristics. Most importantly, in the first time, a topological phase transition assisted by the Dexter electron exchange process has been found.

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