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Temperature-controlled giant thermal magnetoresistance behaviors in doped zigzag-edged silicene nanoribbons

机译：掺杂曲折边缘的硅纳米带中的温度控制巨型热磁阻行为

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摘要

Based on the nonequilibrium Green's function (NEGF) method combined with density functional theory (DFT), we investigate the spin-dependent thermoelectric transport properties of zigzag-edged silicene nanoribbons (ZSiNRs) doped by an Al-P bonded pair at different edge positions. For the ferromagnetic (FM) configuration, the strong quantum destructive interference effects between the localized states induced by the Al-P bonded pair and the side quantum states results in the appearance of spin-dependent transmission dips near the Fermi level. This fact leads to the simultaneous enhancement of the spin-filter efficiency and spin Seebeck coefficient at the Fermi level, while their signs are dependent on the doping positions. Moreover, for the antiferromagnetic (AFM) configuration, the spin-dependent transmission peaks with ordinary Lorentzian shapes near the Fermi level can be introduced by the Al-P bonded pair. Interestingly, a pure spin current in the doped AFM ZSiNRs can be achieved by modulating the temperature. In this case, the spin-filter efficiency can reach infinity, while the thermal magnetoresistance (TMR) between the FM and AFM configurations can also reach infinity.
机译：基于非平衡格林函数（NEGF）方法和密度泛函理论（DFT），我们研究了在不同边缘位置掺杂有Al-P键对的Z型锯齿状硅纳米带（ZSiNRs）的自旋依赖性热电输运性质。对于铁磁（FM）配置，由Al-P键合对诱导的局域态和侧量子态之间的强量子破坏性干涉效应导致在费米能级附近出现自旋相关的传输倾角。这一事实导致在费米能级上同时提高了自旋滤波器的效率和自旋塞贝克系数，而它们的符号取决于掺杂位置。此外，对于反铁磁（AFM）配置，可以通过Al-P键对引入具有费伦能级附近的普通洛伦兹形状的自旋相关传输峰。有趣的是，可以通过调节温度来实现掺杂的AFM ZSiNRs中的纯自旋电流。在这种情况下，自旋滤波器的效率可以达到无穷大，而FM和AFM配置之间的热磁阻（TMR）也可以达到无穷大。

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