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磁调控对硅烯器件光电输运性质的影响

The Effect of Magnetic Modulation on the Transport Properties of Silicene Devices
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摘要 基于第一性原理方法,该文研究了硅烯器件对外部磁场的响应及其光电输运性质.根据左右电极自旋磁构型特点,构建了2种硅器件结构:左右电极磁矩方向平行的P构型和磁矩方向反平行的AP构型.研究发现:通过调节磁场,器件电子透射率可以在导电态和绝缘态之间切换.此外,这2种器件在光学伽伐尼效应下获得了不同的光电流.在AP构型中,纯自旋流既不依赖于光子的能量,也不受入射光偏振角影响,而P构型则不是.通过调整轨道对称性实现电导切换以及通过磁场调制产生纯自旋流的方法可以用于硅烯电子器件的设计. Based on a first principles approach,we have investigated the response of silicane devices to external magnetic fields and their optoelectronic transport properties.Two silicon device structures have been constructed based on the spin-magnetic configuration of the left and right leads:a P configuration with parallel magnetic moments and an AP configuration with anti-parallel magnetic moments.It is found that by adjusting the magnetic field,the device′s electron transmission could be switched between the conducting and insulating states.In addition to this,the two devices obtain different photocurrents under the photogalvani effect.Interestingly,the pure spin current in the AP configuration is neither dependent on the energy of the photon nor is it affected by the angle of polarization of the incident light,whereas the P configuration is not.Mechanisms to achieve conductance switching by adjusting orbital symmetry and methods to generate pure spin currents through magnetic field modulation could be considered in the design of future electronic devices from silicane.
作者 商晓菲 曹如凤 薛俊 李月君 周艳红 SHANG Xiaofei;CAO Rufeng;XUE Jun;LI Yuejun;ZHOU Yanhong(College of Science,East China Jiaotong University,Nanchang Jiangxi 330013,China)
出处 《江西师范大学学报(自然科学版)》 CAS 北大核心 2023年第5期477-482,共6页 Journal of Jiangxi Normal University(Natural Science Edition)
基金 国家自然科学基金(12264014) 江西省自然科学基金(2022ACBL212005) 江西省研究生创新专项基金(YC2021-S425、YC2022-S491) 国家级大学生创新训练计划(202210404010)资助项目。
关键词 光学伽伐尼效应 空间反演对称性 轨道对称性 自旋密度 photogalvani effect spatial inversion symmetry orbital symmetry spin density
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