费米速度调制下石墨烯正常/铁磁/正常异质结电子输运  

Electronic Transport in the Normal/Ferromagnetic/Normal Heterojunction of Graphene Modulated by the Fermi Velocity

作　　者：韦海星 吴智辉[1] 张志海[2] 袁建辉[1] 

机构地区：[1]广西医科大学物理学教研室,广西 南宁 [2]盐城师范学院物理与电子工程学院,江苏 盐城

出　　处：《现代物理》2024年第2期71-78,共8页Modern Physics

摘　　要：空间速度控制石墨烯电子传输波已被提出,基于此,我们提出了一个石墨烯正常/铁磁/正常异质结,通过铁磁体沉积石墨烯层的近邻效应诱导的交换场,探讨基于空间速度调制控制的石墨烯异质结依赖于自旋的电子输运行为。研究结果发现:不同自旋的电子透射系数和传导系数明显依赖于费米速度和交换场,呈现出近似周期振荡特性。自旋反平行于交换场的传导系数明显高于自旋平行于交换场的传导系数,从而导致自旋极化的产生,自旋极化率可高达约−60%。这开启一种全新的依赖于自旋的电子器件的可能性。Spatial velocity modulation control of electron transmission waves in graphene has been proposed. Based on this, we propose a normal/ferromagnetic/normal heterojunction of graphene, and investigate the spin-dependent electron transport behavior of the graphene heterojunction with spatial velocity modulation control in the presence of the exchange field induced by the ferromagnet deposition on the graphene layer. The results show that the transmission and conduction coefficients of the electron with different spins are obviously dependent on Fermi velocity and exchange field, and show approximately periodic oscillation characteristics. The conduction coefficient of spin inversion parallel to the exchange field is significantly higher than that of spin parallel to the exchange field, resulting in spin polarization, which can reach about −60%. This could open up a whole new class of spin-dependent electronic devices.

关 键 词：石墨烯 电子输运 费米速度 自旋极化率 

分 类 号：O41[理学—理论物理]