Realizing a symmetry protected topological phase through dimerized interactions

Abstract

We show that in a system of one dimensional spinless fermions a topological phase and phase transition can emerge only through interaction. By allowing a dimerized or bond-alternating nearest neighbour interaction we show that the system exhibits a symmetry protected topological phase while its non-interacting limit is a gapless state. The non-trivial topological character appears due to the onset of two degenerate bond-order phases as a function of dimerized interaction which are found to be topologically distinct from each other. As a result a topological phase transition occurs between these bond order phases through a gap closing point. However, in the limit of strong interaction, the bond order phases are connected through a gapped charge density wave phase possessing local antiferromagnetic order. The topological nature is characterized by the edge states, Berry phase and non-local string order parameter. At the end we provide possible experimental signatures of the emergent symmetry protected topological phase transition in terms of Thouless charge pumping and density-density correlation.

4+ pages, 4 figures

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Cited by in corpus (6)

• Symmetry-Enriched Criticality in a Coupled Spin-Ladder
• Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
• Role of Bath-Induced Many-Body Interactions in the Dissipative Phases of the Su-Schrieffer-Heeger Model
• Interaction driven topological phase transitions of hardcore bosons on a two-leg ladder
• Quantized Thouless pumps protected by interactions in dimerized Rydberg tweezer arrays
• Reentrant topology and reverse pumping in a quasiperiodic flux ladder