调制磁场下石墨烯的电子输运性质

The study on quantum manipulation and transport properties of graphene under electromagnetic field is an important subject of the condensed matter physics, and also a basis for the design of graphene-based electron device. In this project, we will study the transport properties of Dirac electrons in graphene under modulated magnetic field, using theoretical method (such as transfer matrix, scattering theory, and nonequilibrium Green function) and numerical simulation. In particular, we study the influence of structure's variation of magnetic superlattices (such as defect and quasiperiodic sequence) on electronic transport, electronic states, and energy spectrum; study the magnetic edge states and electronic transport in magnetic quantum dots and magnetic quantum rings. As a target, the transport properties and the laws of energy spectrum in different types of magnetic superlattices will be revealed; the inherent relation between magnetic edge states and electronic transport will be clarified. These results will provide a physical basis for the design of graphene-based electron device.

电磁场作用下石墨烯的量子调控和输运性质是凝聚态物理的研究重点，也是设计石墨烯电子器件的基础。本项目拟利用传输矩阵、散射理论和非平衡格林函数等理论方法结合数值模拟研究调制磁场下石墨烯中Dirac电子的输运性质。具体研究：磁超晶格的结构调制（比如结构缺陷或者准周期性）对电子输运、电子态和能谱规律的影响；磁量子点和磁量子环中磁边缘态和电子输运的性质。预期将揭示不同构型调制下磁超晶格的电子输运性质和能谱规律；阐明磁量子点中磁边缘态的性质及其与电子输运间的内在关联。研究结果将为新型石墨烯电子器件的设计提供物理依据。

电磁场作用下石墨烯的量子调控和输运性质是凝聚态物理的研究重点，也是设计石墨烯电子器件的基础。本项目利用传输矩阵和散射理论等理论方法结合数值模拟研究了一对平行/反平行磁结构调制下石墨烯电子的输运性质，分析了不同磁结构对电子输运和电子态的影响；研究了两类具有光滑界面的真实磁势垒中石墨烯电子的输运性质，讨论了静电场对输运的调制作用。揭示了不同构型磁调制下石墨烯的电子态特点和输运性质；提出了一种设计磁阻器件的新方法。