Investigation of Quantum Coherence and Correlated Dynamics Using Attosecond Spectroscopy

使用阿秒光谱研究量子相干性和相关动力学

• 批准号: 1912455
• 负责人: Arvinder Sandhu
• 金额: $ 39.82万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-15 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1912455&HistoricalAwards=false
• 关键词: Investigation; Quantum; Coherence; Correlated; Dynamics

Electron motion is fundamental to the natural and laboratory phenomena that govern our daily lives, examples being photosynthesis, chemical processes, electronic circuits, etc. Being elementary particles, electrons are extremely agile, and can move inside atoms, molecules and materials on the timescale of attoseconds, which is a billionth of a billionth of a second. To understand the functioning of physical, chemical and biological processes important to us, it is useful to be able to resolve and control the underlying fast electronic motion. Recently devised attosecond spectroscopy provides exactly such an opportunity, where attosecond duration light pulses can be used to strobe the dynamics of electrons. The researchers supported by this project will develop methods to study how electrons help to redistribute energy within molecules. Success along these directions could open up opportunities for direct control of chemical processes in complex molecules relevant for light harvesting and energy storage. The proposed program will therefore advance US scientific efforts in a frontier area of research, while training the next generation of scientists belonging to diverse backgrounds.This project aims for detailed investigation of quantum coherence and correlated electronic and nuclear dynamics using ultrafast light pulses. These studies will focus on what transpires at the quantum level, in terms of interactions between electrons, couplings between electrons and nuclei, and between molecules and the environment. The natural timescale for the evolution of electronic superpositions is in the femtoseconds to attosecond regime, so these investigations will involve the application of attosecond to femtosecond x-ray, extreme ultraviolet, and infrared light pulses. The scientific objectives of the project are: (1) Investigation of correlated decay dynamics of molecular excited states, (2) Study of coherent charge migration and decoherence mechanisms, and (3) Implementation of new techniques to study charge directed reactivity. These objectives will be achieved while training graduate and undergraduate students in the field of attosecond spectroscopy. Velocity map imaging and attosecond transient absorption techniques will be used in the proposed work. The far-reaching objective is to build bridges between the field of physics, and those of chemistry, biology and material sciences, paving the way for control of a variety of electron driven processes. The project will also conduct outreach by involving undergraduates and the local community, and by creating advanced research opportunities for members of under-represented groups.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

电子运动是控制我们日常生活的自然和实验室现象的基础，例如光合作用，化学过程，电子电路等。作为基本颗粒，电子非常敏捷，可以在Attoseconds的时间表上移动原子，分子和材料，这是二十亿美元的秒数。要了解对我们重要的物理，化学和生物过程的功能，能够解决和控制潜在的快速电子运动很有用。最近设计的AttoSend光谱法提供了如此的机会，其中attosend持续时间脉冲可用于将电子动力学用来。该项目支持的研究人员将开发方法来研究电子如何帮助分子内的能量。沿这些方向的成功可以为直接控制与光收集和能量储存相关的复杂分子中的化学过程提供机会。因此，该计划将在研究的边界领域推进我们的科学努力，同时培训属于不同背景的下一代科学家。该项目旨在详细研究使用超快光脉冲对量子相干性以及相关的电子和核动力学的研究。这些研究将集中于量子水平的变化，从电子之间的相互作用，电子与核之间的耦合以及分子与环境之间的相互作用。电子叠加演变的自然时间尺度是在触觉方面的飞秒中，因此这些研究将涉及将attosecond应用于飞秒X射线，极端紫外线和红外光脉冲。该项目的科学目标是：（1）研究分子激发态的相关衰减动力学，（2）研究一致的电荷迁移和分离机制，以及（3）实施新技术来研究电荷有向反应性。这些目标将在培训Attsecond光谱学领域的毕业生和本科生时实现。速度图成像和ATTSOND瞬时吸收技术将用于拟议的工作。深远的目标是在物理领域与化学，生物学和物质科学领域之间建造桥梁，为控制各种电子驱动过程铺平道路。该项目还将通过涉及本科生和当地社区，并为代表性不足的小组成员创造高级研究机会来进行外展活动。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准通过评估来支持的。

项目成果

Ultrafast Rydberg-state dissociation in oxygen: Identifying the role of multielectron excitations

• DOI: 10.1103/physreva.99.063403
• 发表时间: 2019-06
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: A. Plunkett;N. Harkema;R. Lucchese;C. W. McCurdy;A. Sandhu

Raman Interferometry between Autoionizing States to Probe Ultrafast Wave-Packet Dynamics with High Spectral Resolution

• DOI: 10.1103/physrevlett.128.083001
• 发表时间: 2022-02-22
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Plunkett, A.;Alarcon, M. A.;Sandhu, A.
• 通讯作者: Sandhu, A.

Phonon Lifetimes in Boron‐Isotope‐Enriched Graphene‐ Hexagonal Boron Nitride Devices

硼的声子寿命——同位素——富集石墨烯——六方氮化硼器件

• DOI: 10.1002/pssr.202200030
• 发表时间: 2022
• 期刊: physica status solidi (RRL
• 作者: Brasington, Alexandra;Liu, Song;Taniguchi, Takashi;Watanabe, Kenji;Edgar, James H.;LeRoy, Brian J.;Sandhu, Arvinder
• 通讯作者: Sandhu, Arvinder