Abstract
We explore topological phase transition, which involves the energy spectra of field-induced spin-density-wave (FISDW) states in quasi-one dimensional (Q1D) organic conductors, using an extended Su-Schrieffer-Heeger (SSH) model. We show that, in presence of half magnetic-flux FISDW state, the system exhibits topologically nontrivial phases, which can be characterized by a nonzero Chern number. The nontrivial evolution of the bulk bands with chemical potential in a topological phase transition is discussed. We show that the system can have a similar phase diagram which is discussed in the Haldane’s model. We suggest that the topological feature should be tested experimentally in this organic system. These studies enrich the theoretical research on topologically nontrivial phases in the Q1D lattice system as compared to the Haldane topological phase appearing in the two-dimensional lattices.
Highlights
We thank Yi-Fei Wang and Shun-Li Yu for useful discussions
In presence of half magnetic-flux field-induced spindensity-wave (FISDW) state, the system exhibits topologically nontrivial phases, which can be characterized by a nonzero Chern number
We show that the system can have a similar phase diagram which is discussed in the Haldane’s model
Summary
When a strong magnetic field is applied ⊥ to the conducting chain of the Q1D compounds, there is a phase transition from the metallic state to a FISDW state. If the dimerization effect induced gap is larger than E0, the density of state at different sites is zero except the edge site. In this case, the system is in topological insulator state. If the dimerization effect induced gap is not big enough, the density of state at different sites is shown in Fig. 4(d) when energy is greater than E0.
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