单层二硫化钼纳米电子器件中的磁光调控输运性质研究

项目名称： 单层二硫化钼纳米电子器件中的磁光调控输运性质研究

项目编号： No.11504137

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 叶恩钾

作者单位： 江南大学

项目金额： 20万元

中文摘要： 二硫化钼是一种类石墨烯蜂窝状的层状半导体材料。除了具有轻薄、稳定和电子高迁移率等性质外，体系中的对称反演破缺性质和强自旋轨道耦合作用能实现自旋极化、谷电子极化和光跃迁等物理现象。特殊的磁学和光学性质，使二硫化钼在磁电、光电纳米器件研究领域有着广阔的应用前景。而从理论上准确地理解和调控二硫化钼纳米器件中的电子输运行为是推进其研究和应用的关键步骤。本项目采用紧束缚近似理论和非平衡格林函数方法，研究单层二硫化钼纳米器件中的电子输运问题，重点考虑磁场、光跃迁和磁光效应的作用。我们首先考虑在磁场作用下，锯齿型和扶手椅型二硫化钼器件中的朗道能级和输运性质；其次，研究二硫化钼器件中的光跃迁性质及其对电子输运的影响。最后，我们还将进一步探究磁光效应对二硫化钼器件中电子输运的调控和整流效应。本项目旨在揭示二硫化钼纳米器件中磁电、光电输运的物理机制和规律，为二硫化钼纳米电路设计和调控提供理论参考和依据。

中文关键词： 二硫化钼纳米器件；电子输运；非平衡格林函数方法；磁光效应

英文摘要： Layered molybdenum disulfide is one of the semi-conductor materials with the honeycomb structure akin to graphene. Besides the thin, steady structure and high mobility of electrons, the spin and valley polarizations as well as optical interband transitions can be driven due to the inversion symmetry breaking and a strong spin-orbit coupling in molybdenum disulfide system. Since the exotic magnetoelectronic and optical properties, molybdenum disulfide may have certain practical significance in applications of magnetoelectronic and optoelectronic nano-devices. During the process of applications, it is very important to understand and manipulate the electronic transport in molybdenum disulfide nano-device effectively. This project studies the electronic transport in molybdenum disulfide nano-devices with considering the effect of magnetic field, optical interband transitions and magneto-optical absorption, by using the tight-binding approximation and nonequilibrium Green’s function method. Firstly, the Landau level and electronic transport of the molybdenum disulfide nano-devices with zigzag and armchair edges are studied in the magnetic field. Secondly, we explore the optical interband transitions to display the optical-controlled electronic transport. Furthermore, we will investigate the properties of electronic transport and rectification effect in molybdenum disulfide nano-devices by considering the magneto-optical effect. The project aims to reveal the features of the magnetoelectronic and optoelectronic transports in molybdenum disulfide nano-devices, and provide a theoretical basis for its applications of the circuit designing and quantum manipulating.

英文关键词： molybdenum disulfide nanodevices;electronic transport;nonequilibrium Green's function method;Magneto-optical effects