Disorder-induced Majorana zero modes in a dimerized Kitaev superconductor chain

Motivated by the recent experimental observation of the topological Anderson insulator in disordered atomic wires based on the Su-Schrieffer-Heeger (SSH) model, we study disorder effects on a dimerized Kitaev superconductor chain, which is regarded as the superconductor version of the SSH model. By...

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Bibliographic Details
Published in:Physical review. B 2019-11, Vol.100 (20), p.1, Article 205302
Main Authors: Hua, Chun-Bo, Chen, Rui, Xu, Dong-Hui, Zhou, Bin
Format: Article
Language:English
Subjects:
Born approximation
Chains
Dimerization
Phase transitions
Resistance
Topology
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Summary:Motivated by the recent experimental observation of the topological Anderson insulator in disordered atomic wires based on the Su-Schrieffer-Heeger (SSH) model, we study disorder effects on a dimerized Kitaev superconductor chain, which is regarded as the superconductor version of the SSH model. By computing the real-space winding number and the zero-bias differential conductance, we analyze the topological phase transitions occurring in a dimerized Kitaev superconductor chain with disorder. It is found that disorder can induce a topologically nontrivial superconductor phase hosting Majorana zero modes (MZMs). We can regulate the appearance of disorder-induced MZMs by adjusting the dimerization parameter. Finally, we use the self-consistent Born approximation method to verify the numerical results.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.205302