Understanding the Influence of Low-Frequency Vibrations on Energy Relaxation Through Layered Nanomaterials

通过层状纳米材料了解低频振动对能量弛豫的影响

• 批准号: 1807999
• 负责人: Kenneth Knappenberger
• 金额: $ 37.57万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1807999&HistoricalAwards=false
• 关键词: Understanding; Influence; Low; Frequency; Vibrations

Quantum-confinement occurs when an object's dimensions are small compared to the size of electron motion. Many modern electronic devices, which range from medical diagnostics and therapeutics instruments, to high-resolution optical displays and flexible electronics, rely on quantum-confined nanostructures. However, realization of their full potential requires a fundamental understanding of their interactions with light. With support from the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry, Professor Kenneth Knappenberger from Pennsylvania State University (PSU) is developing advanced magneto-optical measurement capabilities to probe quantum-confined structures. Professor Knappenberger and his students are using the unique capabilities of this instrument to understand the behavior of electrons in transition metal dicholcogenide (TMD) materials, and how they interact with vibrations in the crystal lattice. The insights gained from the work could impact existing optoelectronic and photonic technologies, as well as emerging quantum information and sensing applications. The project is also providing training opportunities for future scientists in advanced experimental techniques. As part of this project, Professor Knappenberger has established a local student section of the Optical Society of America at Penn State. This activity facilitates a weekly brown-bag optics club lunch, hosted in the Millennium Science Complex at PSU. Students are able to present their research progress in an informal setting that includes faculty, postdoctoral, graduate, and undergraduate students. The program also includes a component for a high school volunteer student. This student acquires skills in data analysis and processing. The research team is developing and using novel variable-temperature, variable-magnetic field (VTVH) spectroscopy methods to characterize the electronic structure of a series of two-dimensionally confined quantum materials, including multi-component structures featuring combinations of 0-D/1-D/2-D systems. The overall objective is to understand how electronic carrier coupling to low-frequency phonon modes affects the relaxation dynamics of these systems. In order to achieve this fundamental research goal, the team is developing VTVH ultrafast two-dimensional spectroscopy (VTVH-2DES) capabilities, and using them to characterize key parameters of transient exciton states, such as Lande g factors, zero-field splitting energies, and electron-phonon coupling strengths. Monitoring transient signal amplitudes from these excitons in the time- and energy-domains provides insight into phonon-mediated energy relaxation and transfer in quantum materials. The research activities include 1) understanding the optical properties and electronic structure for single and multi-layer 2-D confined TMDs, 2) development of VTVH-2DES infrastructure of characterizing TMD transient states, 3) quantitatively describing quantum-state-specific electron-phonon coupling and carrier dynamics for TMDs; and 4) understanding fundamental mechanisms of phonon-mediated energy transfer in multi-component quantum structures.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.

与电子运动的大小相比，当物体的尺寸较小时，就会发生量子量。从医学诊断和治疗仪器到高分辨率的光学显示和灵活的电子设备，许多现代电子设备都依赖于量子限制的纳米结构。但是，实现其全部潜力需要对他们与光的相互作用有基本的理解。在化学系的大分子，超分子和纳米化学计划的支持下，宾夕法尼亚州立大学（PSU）的肯尼斯·纳潘伯格教授正在开发先进的磁光测量能力，以探测量子量固定的结构。 Knappenberger教授和他的学生正在使用该仪器的独特功能来了解电子在过渡金属二甲基元素（TMD）材料中的行为，以及它们如何与晶体晶格中的振动相互作用。 从工作中获得的见解可能会影响现有的光电和光子技术，以及新兴的量子信息和传感应用。该项目还为未来的科学家提供了高级实验技术的培训机会。 作为该项目的一部分，Knappenberger教授在宾夕法尼亚州立大学建立了美国光学学会的当地学生部分。这项活动促进了每周在PSU的千年科学综合体举办的每周一次的Brown-Bag Optics Club午餐。学生能够在包括教职员工，博士后，研究生和本科生在内的非正式环境中介绍他们的研究进度。该计划还包括一个高中志愿学生的组成部分。该学生获得数据分析和处理方面的技能。 研究团队正在开发和使用新颖的变量，可变磁场（VTVH）光谱法来表征一系列二维限制的量子材料的电子结构，包括具有0-D/1-D/2-D系统组合的多组分结构。总体目标是了解电子载体耦合与低频声音模式如何影响这些系统的放松动力学。为了实现这一基本研究目标，该团队正在开发VTVH超快二维光谱（VTVH-2DES）功能，并使用它们来表征瞬态激子态的关键参数，例如Lande G因素，零局部跨场拆分能量，以及电子 - 频率耦合的强度。从时间和能量组中监测这些激子的瞬时信号振幅可洞悉量子介导的能量放松和量子材料中的传递。 The research activities include 1) understanding the optical properties and electronic structure for single and multi-layer 2-D confined TMDs, 2) development of VTVH-2DES infrastructure of characterizing TMD transient states, 3) quantitatively describing quantum-state-specific electron-phonon coupling and carrier dynamics for TMDs; 4）理解多组分量子结构中语音介导的能量转移的基本机制。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，被视为值得通过评估来获得支持。

项目成果

Unexpected Near-Infrared to Visible Nonlinear Optical Properties from 2-D Polar Metals

二维极性金属具有意想不到的近红外到可见非线性光学特性

• DOI: 10.1021/acs.nanolett.0c03481
• 发表时间: 2020
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Steves, Megan A.;Wang, Yuanxi;Briggs, Natalie;Zhao, Tian;El-Sherif, Hesham;Bersch, Brian M.;Subramanian, Shruti;Dong, Chengye;Bowen, Timothy;Fuente Duran, Ana De
• 通讯作者: Fuente Duran, Ana De

Magneto-Optical Properties of Noble Metal Nanostructures

• DOI: 10.1146/annurev-physchem-062322-043108
• 发表时间: 2023-01-01
• 期刊: ANNUAL REVIEW OF PHYSICAL CHEMISTRY
• 影响因子: 14.7
• 作者: Foxley, Juniper;Knappenberger, Kenneth L., Jr.
• 通讯作者: Knappenberger, Kenneth L., Jr.

Influence of Band Alignment on Electronic Relaxation in Plasmonic Metal–Semiconductor Hybrid Nanoparticles

• DOI: 10.1021/acs.jpcc.2c01378
• 发表时间: 2022-05
• 期刊: The Journal of Physical Chemistry C
• 作者: William R. Jeffries;A. Fagan;R. Schaak;K. Knappenberger

Correlated spatially resolved two-dimensional electronic and linear absorption spectroscopy

相关空间分辨二维电子和线性吸收光谱

• DOI: 10.1364/ol.44.002117
• 发表时间: 2019
• 期刊: Optics Letters
• 影响因子: 3.6
• 作者: Steves, Megan A.;Zheng, Hongjun;Knappenberger, Kenneth L.
• 通讯作者: Knappenberger, Kenneth L.

Tenth-Order Multiphoton Excitation and Saturable Second Harmonic Generation in Polyoxometalate-Exfoliated Molybdenum Disulfide

• DOI: 10.1021/acs.jpcc.2c05739
• 发表时间: 2022-10
• 期刊: The Journal of Physical Chemistry C
• 作者: M. Steves;A. Jawaid;Ariel Struzyk;R. Torsi;J. Robinson;R. Vaia;K. Knappenberger