Collaborative research: Graphene-based THz photodetectors

这项研究的目的是通过开发具有卓越的灵敏度、动态范围、响应速度和非低温工作温度的第一代基于太赫兹的石墨烯光电探测器来填补太赫兹光谱领域的技术“空白”。该方法是基于监测量子霍尔态石墨烯和/或双量子点单电子晶体管中太赫兹辐射引起的电导变化。智慧价值这项研究利用了石墨烯非凡的电子迁移率、长弹道长度和独特的相对论能带结构，这可能使新的太赫兹辐射探测器成为可能。石墨烯太赫兹探测器将作为偏置、器件几何形状、温度、载流子密度和磁场的函数进行探索，以评估关键器件参数，如工作温度、选择性、可调性、灵敏度和噪声水平。这项研究的长期目标是开发非低温下的太赫兹成像系统。这项研究计划的成功实施将为填补太赫兹地区的技术“空白”提供重大进展，该地区具有从半导体工业、生物医学研究、空间探索到材料基本过程研究工具的巨大应用潜力。该计划还提供了一个理想的平台，将物理教育和推广与研究工作结合起来，让高中生、本科生和研究生参与进来，鼓励女性和代表性较低的少数族裔学生参与，并扩大到拥有不同种族人口的当地社区。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)"The objective of this research is to fill the technological "gap" at the THz spectral region, by developing the first generation of THz graphene-based photodetectors with exceptional sensitivity, dynamic range, response rate and non-cryogenic operating temperatures. The approach is based on monitoring conductance change induced by THz radiation in graphene in quantum Hall states, and/or in double quantum dot single electron transistors. Intellectual MeritThis research exploits graphene's exceptional electronic mobility, long ballistic length and unique relativistic band structure, which could enable new detectors of THz radiation. Graphene THz detectors will be explored as functions of bias, device geometry, temperature, charge carrier density and magnetic field, for evaluation of crucial device parameters such as operating temperatures, selectivity, tunability, sensitivity, and noise levels. The long-term goal of this research is the development of THz imaging systems at non-cryogenic temperatures.Broader ImpactSuccessful implementation of this research program will provide significant advancement to fill the technology "gap" at the THz region, which has vast application potential ranging from semiconductor industry, biomedical research, space exploration to tools for study of fundamental processes in materials. The program also provides an ideal platform to integrate physics education and outreach with research efforts, by involving high school, undergraduate and graduate students, by encouraging participation of women and underrepresented minority students, and by outreach to local communities with ethnically diverse populations.