扭曲双层之字形石墨烯纳米带中的非互易自旋输运

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-24 DOI:10.1063/5.0285200

Shujie Yu, Jichao Sheng, Jia Zhang, Yurong Su

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引用次数: 0

摘要

具有两个反铁磁耦合边的之字形石墨烯纳米带（ZGNRs）具有PT（联合空间反演和时间反演）对称性和自旋双简并电子结构。通过结构设计打破PT对称，我们可以在具有不同堆叠构型和扭曲角度的扭曲双层zgnr （tbzgnr）中产生空间自旋密度，形成一类准一维碳纳米带反铁磁体。利用非平衡格林函数方法研究了tbzgnr中的自旋输运，揭示了非pt对称tbzgnr中的电流是非互反的自旋极化。此外，在PT对称tbzgnr中，施加偏置电压可以解除自旋简并。在正、负偏置电压下表现出独特的非倒易自旋输运和相反的自旋极化。我们的结果表明tbzgnr应该是有用的碳基材料，具有反铁磁有序和自旋极化输运。因此，本研究提供了一种通过结构设计实现石墨烯纳米带和碳基自旋电子学自旋输运的策略。

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Nonreciprocal spin transport in twisted bilayer zigzag graphene nanoribbons

Zigzag graphene nanoribbons (ZGNRs) with two antiferromagnetic coupled edges possess PT (combined spatial inversion and time reversal) symmetry and spin double degenerate electronic structures. By breaking PT symmetry via the structure design, we are able to generate spatial spin density in twisted bilayer ZGNRs (TBZGNRs) with different stacking configurations and twisted angles, forming a class of quasi-one dimensional carbon nanoribbon antiferromagnets. We investigate the spin transport in TBZGNRs by employing the non-equilibrium Green's functions method and reveal that the electric current is nonreciprocal and spin-polarized in non-PT symmetric TBZGNRs. Moreover, in PT symmetric TBZGNRs, the spin degenerate can be lifted by applying bias voltage. It shows unique nonreciprocal spin transport with opposite spin-polarization under positive and negative bias voltages. Our results indicate that TBZGNRs should be useful carbon-based materials exhibiting antiferromagnetic order and spin-polarized transport. Thus, this work provides a strategy to achieve spin transport in graphene nanoribbons and carbon-based spintronics via the structural design.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.