Volume 124, Number 3, November 2018
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 December 2018|
Topological phases of modulated Su-Schrieffer-Heeger chains with long-range interactions
School of Physics, Dalian University of Technology - Dalian 116024, China
Received: 16 April 2018
Accepted: 6 November 2018
The cyclically modulated Su-Schrieffer-Heeger (SSH) chain systems with long-range hoppings, including the nearest-neighbor, the next-nearest-neighbor and the third-nearest-neighbor hoppings, have been proposed and investigated in this letter. The topological nontrivial phases characterized by Chern number have been obtained, showing a rich phase diagram in the two-dimensional space of the momentum and the modulation parameter. A similar shape of phase diagram but with different Chern numbers as Haldane model with long-range hoppings has been shown, and higher Chern numbers have been obtained and verified, indicating that more edge states can be obtained in such system.
PACS: 75.10.-b – General theory and models of magnetic ordering / 03.65.Vf – Phases: geometric; dynamic or topological / 73.21.Cd – Superlattices
© EPLA, 2018
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