Large positive magnetoconductance in carbon nanoscrolls

• URL: http://arxiv.org/abs/2408.03518v2
• Date: Wed, 22 Jan 2025 02:48:25 GMT
• Title: Large positive magnetoconductance in carbon nanoscrolls
• Authors: Yu-Jie Zhong, Jia-Cheng Li, Xuan-Fu Huang, Ying-Je Lee, Ting-Zhen Chen, Jia-Ren Zhang, Angus Huang, Hsiu-Chuan Hsu, Carmine Ortix, Ching-Hao Chang,
• Abstract summary: We show that when a carbon nanoscroll is subject to an axial magnetic field of several Tesla, the ballistic conductance at low carrier densities of the nanoscroll has an increase of about 200%.<n>We prove that the positive magnetoconductance comes about the emergence of magnetic field-induced zero energy modes.
• Score: 13.795932972378933
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We theoretically demonstrate that carbon nanoscrolls -- spirally wrapped graphene layers with open endpoints -- can be characterized by a large positive magnetoconductance. We show that when a carbon nanoscroll is subject to an axial magnetic field of several Tesla, the ballistic conductance at low carrier densities of the nanoscroll has an increase of about 200%. Importantly, we find that this positive magnetoconductance is not only preserved in an imperfect nanoscroll (with disorder or mild inter-turn misalignment) but can even be enhanced in the presence of on-site disorder. We prove that the positive magnetoconductance comes about the emergence of magnetic field-induced zero energy modes, specific of rolled-up geometries. Our results establish curved graphene systems as a new material platform displaying sizable magnetoresistive phenomena.

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