Quantum transport signatures of non-trivial topological edge states in a ring-shaped Su–Schrieffer–Heeger double-chain system  

作　　者：Cheng-Zhi Ye Lan-Yun Zhang Hai-Bin Xue 叶成芝;张蓝云;薛海斌(School of Physics and Electronic Engineering,Linyi University,Linyi 276005,China;Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]School of Physics and Electronic Engineering,Linyi University,Linyi 276005,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Chinese Physics B》2022年第2期558-565,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11974153);the Natural Science Foundation of Shanxi Province,China(Grant No.20210302123184);the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi Province,China(Grant No.163220120-S);the Natural Science Foundation of Shandong Province,China(Grant No.ZR2020MA091)。

摘　　要：In the ring-shaped Su–Schrieffer–Heeger(SSH)double-chain,the quantum interference between the two different electron tunneling paths of the upper and lower chains has an important influence on the electron transport properties of non-trivial topological edge states.Here,we have studied the electron transport signatures of non-trivial topological edge states in a ring-shaped SSH double-chain system based on the wave-guide theory and transfer-matrix method.In the ringshaped SSH double-chain with the upper chain being different from the lower one,it is demonstrated that the electron transmission probability displays the four and two resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes,respectively.Whereas in the case of the upper chain being the same as the lower one,the two transmission resonance peaks associated with the non-trivial topological edge states in the weak coupling regime are only found,and that in the strong coupling regime disappear that originated from the destructive interference between the two different electron tunneling paths of the upper and lower chains.Consequently,the variation of the number of transmission resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes suggests that an alternative scheme for detecting non-trivial topological edge states in the ring-shaped SSH doublechain system.

关 键 词：ring-shaped Su-Schrieffer-Heeger double-chain non-trivial topological edge states transmission probability 

分 类 号：O469[理学—凝聚态物理]