Andreev reflection in a patterned graphene nanoribbon superconducting heterojunction |
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Authors: | Chunxu Bai Yanling Yang Yongjin Jiang H-X Yang |
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Institution: | 1. Key Lab of Magnetic Materials and Devices, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, 315201, People''s Republic of China;2. College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People''s Republic of China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People''s Republic of China |
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Abstract: | In the study, an improved superconducting heterojunction is made up of a zigzag graphene nanoribbon, which is patterned by a triangle and supports localized edge mode. Since all the localized edge modes stem from a pattern operation, the structure features of the pattern exert an enormous function on the coherent quantum transport. Especially, the patterned modes can enhance the Andreev reflection largely both in the ferromagnetic nanoribbon edge and the antiferromagnetic nanoribbon edge. The spin resolved zero bias conductances, in sharp contrast to its counterpart in the infinite width superconducting heterojunction, exhibit the different dependence on the patterned ferromagnetic interaction. |
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Keywords: | Graphene nanoribbon Andreev reflection Tight-binding model |
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