拉什巴-泽曼和双层石墨烯混合结构中的弹道传输和自旋依赖性反常量子隧道效应

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-01-08 DOI:10.1063/5.0174626
Saumen Acharjee, Arindam Boruah, Reeta Devi, Nimisha Dutta
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引用次数: 0

摘要

在这项研究中,我们研究了在外部电偏压作用下,水平放置在两根拉什巴-泽曼(RZ)导线之间的双层石墨烯中自旋相关弹道传输和反常量子隧道。我们使用散射矩阵形式主义和兰道尔-比提克公式研究了拟议系统的传输和电导,考虑了一组实验可行参数下的双三角屏障。我们发现,根据磁化强度的不同,上旋和下旋入射电子的传输特性明显不同。此外,我们还发现上旋和下旋电子的传输与磁化方向有关。通过调整偏置能量和磁化强度,并选择具有合适的拉什巴自旋轨道耦合(RSOC)的材料,可以获得最大的隧道电导。我们系统的这一惊人特性可用于制造自旋过滤器等器件。我们发现,在强磁化条件下,我们系统的法诺因子为 0.4,而在低磁化条件下则降至 0.3。此外,我们还注意到透射率和电导率在很大程度上取决于拉什巴-泽曼效应。因此,考虑到合适的 RZ 材料,电子的隧道效应是可以调整和控制的。我们的研究结果表明,考虑到具有适度 RSOC 的磁化强度和磁化方向,在合适的偏压能量下,自旋物种可以获得不同的传输概率。这些结果表明,所提出的系统适用于制造自旋电子器件,如自旋滤波器、自旋晶体管等。
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Ballistic transport and spin-dependent anomalous quantum tunneling in Rashba–Zeeman and bilayer graphene hybrid structures
In this work, we have studied the spin-dependent ballistic transport and anomalous quantum tunneling in bilayer graphene horizontally placed in between two Rashba–Zeeman (RZ) leads under external electric biasing. We investigated the transmission and conductance for the proposed system using scattering matrix formalism and the Landauer–Büttiker formula considering a double delta-like barrier under a set of experimentally viable parameters. We found that the transmission characteristics are notably different for up- and down-spin incoming electrons depending upon the strength of magnetization. Moreover, the transmission of up- and down-spin electrons is found to be magnetization orientation dependent. The maximum tunneling conductance can be achieved by tuning biasing energy and magnetization strength and choosing a material with suitable Rashba spin–orbit coupling (RSOC). This astonishing property of our system can be utilized in fabricating devices, such as spin filters. We found that the Fano factor of our system is 0.4 under strong magnetization conditions, while it reduces to 0.3 under low magnetization conditions. Moreover, we also noticed that the transmission and conductance significantly depend on the Rashba–Zeeman effect. Therefore, considering a suitable RZ material, the tunneling of the electrons can be tuned and controlled. Our result suggests that considering suitable strength and orientation of magnetization with moderate RSOC, one can obtain a different transmission probability for spin species under suitable biasing energy. These results indicate the suitability of the proposed system in fabrication of spintronic devices, such as spin filter, spin transistor, etc.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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