石墨烯中强局域规范场与电子多种自由度耦合下的电子态和电子输运研究

项目名称： 石墨烯中强局域规范场与电子多种自由度耦合下的电子态和电子输运研究

项目编号： No.11274124

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 杨谋

作者单位： 华南师范大学

项目金额： 78万元

中文摘要： 石墨烯（单层石墨）中的电子除了常见的轨道和自旋自由度以外，还具有子晶格和顶点自由度，石墨烯电子在多种自由度空间中的电子态特性和控制是当前石墨烯领域的重要热点。近来有研究者将石墨烯吸附在长有纳米凸起物的衬底上导致了局部应变的剧烈变化，进而在亚微米范围内引发数百特斯拉的超强局域规范场。这个强局域规范场能与电子的多种自由度耦合，具有丰富的物理内涵。我们计划研究石墨烯在亚微米尺度局域大应变下的规范场分布以及在该规范场耦合下的电子态和电子输运性质，重点研究局域电子态在非轨道自由度空间中性质和操控，以及多自由度空间中电子输运的极化生成和控制方法，我们还希望找到在超强局域场影响下产生实验上可观测的顶点霍尔效应的新机制和参数条件。本项研究有助于找出石墨烯电子在超强规范场下的的非典型行为和量子态控制的新机理，为石墨烯器件的发展提供新的思路。

中文关键词： 石墨烯；应变；规范场；自由度；

英文摘要： Electrons in graphene (a mono-layer of graphite) have additional degrees of freedom related to sub-lattice and valley, besides usual ones of orbit and spin. The control of electrons in the subspaces of these degrees of freedom is an important aspect in nowadays research of graphene. A recent experiment showed there exists large strain variation when placing a graphene sheet on a substrate with nanorods, and thus an intensive gauge field of several handred Tsela is caused in areas of sub-micron. The local gauge field couples with these degrees freedom of electrons and leads to a variaty of fantasy physics. We plan to investegate the formation of such guage field and the electronics and transport under its influence. We focus on the evolution and manupulation of localized quantum state near the strain variation area in these subspaces, and concentrate on the generation and control of polarization in subspaces when electrons transport. Our research could find out the parameter region for the experimental observation of valley Hall effect under the influence of intensive local gauge field. This project will benefit to understanding the electronics under ultra-intensive gauge field, figuring out new methods for the control of quantum states in graphene, and providing new concepts for constructing graphene devices.

英文关键词： graphene；strain；gauge field；degree of freedom；