Coherent Phonon Dynamics in Semiconductors and Nanotubes

半导体和纳米管中的相干声子动力学

• 批准号: 0706313
• 负责人: Christopher Stanton
• 金额: $ 36万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-12-15 至 2012-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0706313&HistoricalAwards=false
• 关键词: Coherent; Phonon; Dynamics; Semiconductors; Nanotubes

TECHNICAL SUMMARY:This award supports integrated research, education and outreach activities in theoretical condensed matter physics. The goal of this research program is to develop new theoretical models and investigate ultrafast generation of coherent phonons in semiconductors. A key question being addressed is whether such phonon dynamics can be manipulated to influence magnetic and electric polarization to the extent that it has device potential.These research investigations are looking into three new areas to theoretically describe the interactions of the photogenerated coherent phonons with carriers and spins that are already present in the nanostructures under conditions of high electric and magnetic fields and in novel materials such as carbon nanotubes. Researchers will investigate the use femtosecond pulse shaping to manipulate the electric and magnetic fields as well as the carrier, phonon and spin dynamics. The coherent control of magnetic and electric fields and carrier or spin dynamics on an optical time scale will have a broad impact on future device design. Through control of these features with coherent phonons, a variety of novel and interesting possibilities for future device applications in emerging fields such as spintronics or quantum information theory will be garnered. Graduate students will participate in this research effort and benefit by learning theoretical techniques and understanding the materials and technology associated with nanoscience. This work will be the basis for dissertation research leading to the PhD. The principle investigator has record of acting as a mentor of young students and participating in outreach efforts of the department of physics, activities which will continue during this research project.NON-TECHNICAL SUMMARY:Integrated research, education and outreach activities in theoretical condensed matter physics combine as the core activities under this award. The primary motivation of the project stems from the phenomena of atomic vibrations, like sound, generated by lasers in semiconductor materials. The pure frequencies of ultra short laser pulses produce similarly pure and large "sound" waves. These are sufficiently large that the "sound" alters the electric and magnetic properties of the material A goal of this research program is to develop new theoretical models to understand this effect and control it. The characteristic that this occurs extremely fast and in a small area leads to the potential for optical control of the smallest possible electronic devices that are being developed in the field of nanotechnology. Graduate students will participate in this research effort and benefit by learning theoretical techniques and understanding the materials and technology associated with nanoscience. This work will be the basis for dissertation research leading to the PhD. The principle investigator has record of acting as a mentor of young students and participating in outreach efforts of the department of physics, activities which will continue during this research project.

技术概述：该奖项支持理论凝聚态物理的综合研究、教育和推广活动。本研究计划的目标是发展新的理论模型和研究半导体中相干声子的超快产生。要解决的一个关键问题是，这种声子动力学是否可以被操纵，以影响磁和电极化的程度，使其具有器件电位。这些研究着眼于三个新的领域，从理论上描述光产生的相干声子与载流子和自旋的相互作用，这些载流子和自旋已经存在于高电场和磁场条件下的纳米结构中，以及碳纳米管等新型材料中。研究人员将研究利用飞秒脉冲整形来操纵电场和磁场，以及载流子、声子和自旋动力学。磁场和电场的相干控制以及光学时间尺度上的载流子或自旋动力学将对未来的器件设计产生广泛的影响。通过用相干声子控制这些特征，将为自旋电子学或量子信息理论等新兴领域的未来设备应用提供各种新颖和有趣的可能性。研究生将参与这项研究工作，并通过学习理论技术和理解与纳米科学相关的材料和技术而受益。这项工作将成为博士学位论文研究的基础。主要研究者有担任年轻学生导师和参与物理系外展工作的记录，这些活动将在本研究项目中继续进行。非技术总结：理论凝聚态物理的综合研究、教育和推广活动是本奖项的核心活动。该项目的主要动机源于半导体材料中激光产生的原子振动现象，如声音。超短激光脉冲的纯频率也会产生类似的纯而大的“声波”。这些“声音”足够大，以至于“声音”改变了材料的电和磁特性。这项研究计划的目标是开发新的理论模型来理解这种影响并控制它。这一过程发生的速度极快且面积小的特点，使得纳米技术领域中正在开发的尽可能小的电子设备的光学控制成为可能。研究生将参与这项研究工作，并通过学习理论技术和理解与纳米科学相关的材料和技术而受益。这项工作将成为博士学位论文研究的基础。主要研究者有担任年轻学生导师和参与物理系外展工作的记录，这些活动将在本研究项目中继续进行。