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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Magnetic nanotubes: A new material platform to realize a robust spin-Seebeck effect and a perfect thermal spin-filtering effect
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Magnetic nanotubes: A new material platform to realize a robust spin-Seebeck effect and a perfect thermal spin-filtering effect

机译：磁性纳米管：一种新的材料平台，可实现强大的自旋塞贝克效应和完美的热自旋过滤效应

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摘要

To construct reliable material platforms and to uncover new rules to realize spin-Seebeck effect (SSE) and thermal spin-filtering effect (SFE) are core topics in spin caloritronics. Here we design several single-layer boron-nitrogen nanotubes (BNNTs) with n boron (nitrogen) atoms substituted by carbons in every unit cell. We find that for n = 1, the magnetic BNNTs generate a good SSE with nearly symmetric spin-up and spin-down currents, while as the carbon dopant concentration increases (c.f. n ≥ 2), a high rotational symmetry of the carbons contributes to generate the SSE with more symmetric thermal spin-up and spin-down currents, otherwise towards the thermal SFE. Moreover, some metallic BNNTs can generate the SSE or the SFE with finite threshold temperatures, due to the compensation effect around the Fermi level. More importantly, we find that the compression strain engineering is an effective route to improve these effects and to realize the transition between them. These theoretical results about the SSE in nanotubes enrich the spin caloritronics and put forward material candidates to realize the SSE and other inspiring thermospin phenomena.
机译：构造可靠的材料平台并发现实现自旋塞贝克效应（SSE）和热自旋过滤效应（SFE）的新规则是自旋量热电子学的核心主题。在这里，我们设计了几个单层硼氮纳米管（BNNT），每个单位晶胞中的n个硼（氮）原子被碳取代。我们发现，对于n = 1，磁性BNNT产生良好的SSE，具有几乎对称的向上旋转和向下旋转电流，而随着碳掺杂剂浓度的增加（cf n≥2），碳的高旋转对称性有助于产生具有更对称的热旋转和旋降电流的SSE，否则流向热SFE。此外，由于费米能级附近的补偿作用，一些金属BNNT可以在有限的阈值温度下生成SSE或SFE。更重要的是，我们发现压缩应变工程是改善这些效果并实现它们之间过渡的有效途径。这些关于纳米管中SSE的理论结果丰富了自旋热电子学，并提出了实现SSE和其他启发性的热纺现象的材料候选。

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  • 来源
    《Physical review. B, Condensed Matter And Materals Physics》 |2018年第11期|115422.1-115422.8|共8页
  • 作者

    Dan-Dan Wu; Hua-Hua Fu; Qing-Bo Liu; Gui-Fang Du; Ruqian Wu;

  • 作者单位

    School of Physics and Wuhan National High Magnetic field center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    School of Physics and Wuhan National High Magnetic field center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China,Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA;

    School of Physics and Wuhan National High Magnetic field center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    School of Physics and Wuhan National High Magnetic field center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA;

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