Experimental Studies of Graphene Layers

-----------------技术摘要---------------------石墨烯是最近被分离出来的碳的二维晶体，由于其低能激发谱模拟了超相对论粒子而具有非凡的电子特性。这使得制备高质量场效应晶体管和在室温下观察量子霍尔效应成为可能。这项工作的目的是通过将石墨烯与环境隔离来获得其内在特性，并探索在受控的化学或机械扰动引入下出现的新物理现象。我们将通过探索各种衬底的影响以及完全去除衬底的影响来寻求理解和最小化环境对电子特性的影响。我们将探索相互作用、边界、磁场和掺杂剂在准粒子光谱中的作用，以寻找涌现相和新的物理性质。我们将研究基于这些特性制造石墨烯纳米器件的可行性。本课题的主要实验探针包括扫描隧道显微镜、光谱原子力显微镜和磁输运。该项目的工作将在本科和研究生阶段的学生以及博士后的积极参与下进行。----------非技术摘要------------------------最近发现的石墨烯是一种由单个石墨原子平面组成的二维晶体，它使人们能够从模拟超相对论粒子的电荷载流子中获得非凡的电子特性。由于石墨烯的低维性和具有极高载流子迁移率的电荷传输的可能性，它有望成为新一代纳米电子器件的基石。该项目的目标是通过将石墨烯从环境中分离出来来获得其固有特性，并探索在受控的化学或机械扰动引入下物质的新物理现象和新相的出现。我们将探索基于这些特性制造石墨烯纳米器件的可行性。主要的实验探针将包括扫描隧道显微镜和光谱学、原子力显微镜和磁输运。该项目的工作将在本科生和研究生的积极参与下进行。该项目的工作将在本科生、研究生和博士后学生的积极参与下进行。他们将接受尖端研究和使用最先进设备的培训，为填补高要求的技术和研究职位做好准备。

-----------------Technical abstract---------------------Graphene, the recently isolated two dimensional crystal of carbon, possesses extraordinary electronic properties arising from a low energy excitation spectrum which mimics ultra relativistic particles. This makes it possible to achieve high quality field-effect transistors and to observe the quantum Hall effect at room-temperature. The object of this work is to access the intrinsic properties of graphene by isolating it from the environment and to explore the emergence of new physical phenomena in response to the controlled introduction of chemical or mechanical perturbations. We will seek to understand and minimize environmental effects on the electronic properties by exploring the influence of various substrates as well as that of removing the substrate altogether. We will explore the role of interactions, boundaries, magnetic field and dopants on the quasiparticle spectrum in search of emergent phases and new physical properties. We will investigate the feasibility of fabricating graphene nano-devices based on these properties. The primary experimental probes in this project include scanning tunneling microscopy and spectroscopy atomic force microscopy and magneto-transport. Work on this project will be carried out with the active participation of students at the undergraduate and graduate level and with post doctoral fellows. ----------Non-technical abstract------------------------ The recent discovery of graphene, a two-dimensional crystal consisting of a single atomic plane of graphite, gives access to extraordinary electronic properties arising from charge carriers that mimic ultra-relativistic particles. Because of the low dimensionality and the possibility of attaining charge transport with exceptionally high carrier mobility, graphene holds the promise of becoming the building block for a new generation of nanoelectronics devices. The goal of this project is to access the intrinsic properties of graphene by isolating it from the environment and to explore the emergence of new physical phenomena and new phases of matter in response to the controlled introduction of chemical or mechanical perturbations. We will explore the feasibility of fabricating graphene nano-devices based on these properties. The primary experimental probes will include scanning tunneling microscopy and spectroscopy, atomic force microscopy and magneto-transport. Work on this project will be carried out with the active participation of students at the undergraduate and graduate level. Work on this project will be carried out with the active participation of students at the undergraduate, graduate and post doctoral levels. They will receive training in cutting edge research and in the use of state of the art equipment that will prepare them for filling demanding technical and research positions.