Coherent Quantum Dynamics of Indirect Excitons and Valley Pseudospins in Atomically Thin Semiconductor Heterostructures
原子薄半导体异质结构中间接激子和谷赝自旋的相干量子动力学
基本信息
- 批准号:1808042
- 负责人:
- 金额:$ 40万
- 依托单位:
- 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:2018-08-15 至 2022-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Non-Technical Abstract: Scientists have been exploring methods of controlling material properties by confining electron motions to lower dimensions for nearly four decades. These quantum materials have led to improved light emitting devices, such as light emitting diodes and lasers, and information processing and communication devices (e.g. computers and cell phones) that have transformed our lives. It is now possible to create a sheet of matter just a single atom thick. These ultrathin materials, known as monolayer materials, represent the ultimate thickness limit of two dimensional (2D) materials. This project asks how we may create better and more complex 2D materials by stacking two or several of these ultrathin sheets together. Ultrafast laser light pulses, akin to a camera with very fast shutter speed, are used to probe the stacked structures and capture the motion of electrons in the materials. Ultimately, these studies teach us how to control the properties of materials by manipulating individual electrons. New insights on these novel materials guide the development of new energy harvesting and information processing technologies. This project also provides valuable training opportunities for young researchers in areas critical to sustaining the nation's technological competitiveness. Technical Abstract: An emerging class of heterostructures consisting of atomically thin layers represents two-dimensional quantum materials in the ultimate thickness limit. By stacking two monolayer transition metal dichalcogenides (TMD), a semiconducting vertical heterostructure (VHS) is formed. Because of the type II band alignment typically found in TMD VHSs, electrons and holes rapidly transfer to different layers following optical excitation, leading to the formation of interlayer excitons. The research group investigates coherent quantum dynamics associated with interlayer excitons and valley pseudospins in a TMD VHS using a powerful nonlinear spectroscopy tool known as two-dimensional Fourier transform spectroscopy. Understanding the coherent properties of these pseudospins (i.e., excitons and valley index) guides the development of quantum devices based on these novel two-dimensional materials, enabling transformative impacts on information communication and processing technologies. This project also provides valuable training opportunities for young researchers as future workforce, placing the U.S. in a globally competitive position in the emerging market of quantum technology.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.
非技术摘要:近四十年来,科学家们一直在探索通过将电子运动限制在较低维度来控制材料特性的方法。这些量子材料已经改进了发光器件,如发光二极管和激光器,以及信息处理和通信设备(例如计算机和手机),改变了我们的生活。现在可以制造出只有一个原子厚的物质层。这些超薄材料被称为单层材料,代表了二维(2D)材料的最终厚度极限。这个项目询问我们如何通过将两个或几个这样的图纸堆叠在一起来创建更好,更复杂的2D材料。超快激光脉冲类似于快门速度非常快的相机,用于探测堆叠结构并捕获材料中电子的运动。最终,这些研究教会我们如何通过操纵单个电子来控制材料的性质。对这些新型材料的新见解指导了新能源收集和信息处理技术的发展。 该项目还为年轻研究人员提供了宝贵的培训机会,这些领域对维持国家的技术竞争力至关重要。技术摘要:由原子级薄层组成的异质结构代表了极限厚度的二维量子材料。 通过堆叠两个单层过渡金属二硫属化物(TMD),形成半导体垂直异质结构(VHS)。由于在TMD VHS中通常发现的II型能带排列,电子和空穴在光激发后迅速转移到不同的层,导致层间激子的形成。该研究小组使用称为二维傅里叶变换光谱的强大非线性光谱工具,研究了TMD VHS中与层间激子和谷赝自旋相关的相干量子动力学。理解这些赝自旋的相干性质(即,激子和谷指数)指导基于这些新型二维材料的量子器件的开发,从而对信息通信和处理技术产生变革性影响。该项目还为年轻研究人员提供了宝贵的培训机会,使美国在新兴的量子技术市场中处于全球竞争地位。该奖项反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Phonon Dephasing Dynamics in MoS 2
MoS 2 中的声子相移动力学
- DOI:10.1021/acs.nanolett.0c04368
- 发表时间:2021
- 期刊:
- 影响因子:10.8
- 作者:Sun, Liuyang;Kumar, Parveen;Liu, Zeyu;Choi, Junho;Fang, Bin;Roesch, Sebastian;Tran, Kha;Casara, Joshua;Priego, Eduardo;Chang, Yu-Ming
- 通讯作者:Chang, Yu-Ming
Hyperbolic Phonon Polaritons in Suspended Hexagonal Boron Nitride
- DOI:10.1021/acs.nanolett.8b04242
- 发表时间:2019-02-01
- 期刊:
- 影响因子:10.8
- 作者:Dai, Siyuan;Quan, Jiamin;Alu, Andrea
- 通讯作者:Alu, Andrea
Twist Angle-Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures
- DOI:10.1103/physrevlett.126.047401
- 发表时间:2021-01-26
- 期刊:
- 影响因子:8.6
- 作者:Choi, Junho;Florian, Matthias;Li, Xiaoqin
- 通讯作者:Li, Xiaoqin
Optical dielectric constants of single crystalline silver films in the long wavelength range
- DOI:10.1364/ome.385723
- 发表时间:2020-02-01
- 期刊:
- 影响因子:2.8
- 作者:Choi, Junho;Cheng, Fei;Li, Xiaoqin
- 通讯作者:Li, Xiaoqin
Phonon-Assisted Intervalley Scattering Determines Ultrafast Exciton Dynamics in MoSe2 Bilayers
- DOI:10.1103/physrevlett.127.157403
- 发表时间:2021-10-08
- 期刊:
- 影响因子:8.6
- 作者:Helmrich, Sophia;Sampson, Kevin;Li, Xiaoqin
- 通讯作者:Li, Xiaoqin
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Xiaoqin Li其他文献
Systematic design of a cross-polarized dermoscope for visual inspection and digital imaging
用于视觉检查和数字成像的交叉偏振皮肤镜的系统设计
- DOI:
10.1109/mim.2011.6086897 - 发表时间:
2011-12 - 期刊:
- 影响因子:2.1
- 作者:
Qiushi Ren;Xin Xu;Xiaoqin Li;Peng Xi;Hening Wang - 通讯作者:
Hening Wang
Goaf water storage and utilization in arid regions of northwest China: A case study of Shennan coal mine district
西北干旱区采空区蓄水与利用——以深南煤矿区为例
- DOI:
10.1016/j.jclepro.2018.08.123 - 发表时间:
2018-11 - 期刊:
- 影响因子:11.1
- 作者:
Qiqing Wang;Wenping Li;Tao Li;Xiaoqin Li;Shiliang Liu - 通讯作者:
Shiliang Liu
Design of multimedia broadcasting terminal for college English teaching under internet environment
- DOI:
10.3233/jifs-179170 - 发表时间:
2019 - 期刊:
- 影响因子:0
- 作者:
Xiaoqin Li - 通讯作者:
Xiaoqin Li
Protein structure preference, tRNA copy number, and mRNA stem/loop content
蛋白质结构偏好、tRNA 拷贝数和 mRNA 茎/环含量
- DOI:
10.1002/bip.20094 - 发表时间:
2004 - 期刊:
- 影响因子:2.9
- 作者:
L. Luo;Mengwen Jia;Xiaoqin Li - 通讯作者:
Xiaoqin Li
Dietary
Adonis. aestivalis
extract improved the flesh pigmentation, antioxidative status and shelf‐life of rainbow trout (
Oncorhynchus mykiss
)
膳食阿多尼斯提取物改善了虹鳟鱼(Oncorhynchus mykiss)的果肉色素沉着、抗氧化状态和保质期。
- DOI:
10.1111/anu.13144 - 发表时间:
2020 - 期刊:
- 影响因子:0
- 作者:
Chunyan Zhang;Wenxiang Yao;Dengxin Wen;Xiaoqin Li;Shilin Wu;X. Leng - 通讯作者:
X. Leng
Xiaoqin Li的其他文献
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{{ truncateString('Xiaoqin Li', 18)}}的其他基金
Collaborative Research: Ferrimagnetic Insulator Based Bilayers for Interface-Driven Topological Spin Textures
合作研究:基于亚铁磁绝缘体的双层界面驱动拓扑自旋纹理
- 批准号:
2225645 - 财政年份:2022
- 资助金额:
$ 40万 - 项目类别:
Standard Grant
Enhancing Quantum Emissions from Atomically Thin Semiconductors with Metasurfaces
利用超表面增强原子薄半导体的量子发射
- 批准号:
2130552 - 财政年份:2021
- 资助金额:
$ 40万 - 项目类别:
Standard Grant
MRI: Development of A Magneto-Optical Spectroscopy System for Investigation of Spintronic and Quantum Materials
MRI:开发用于研究自旋电子和量子材料的磁光光谱系统
- 批准号:
2019130 - 财政年份:2020
- 资助金额:
$ 40万 - 项目类别:
Standard Grant
Workshop: Current Challenges and Future Opportunities in Electronic and Photonic Materials
研讨会:电子和光子材料当前的挑战和未来的机遇
- 批准号:
1748163 - 财政年份:2017
- 资助金额:
$ 40万 - 项目类别:
Standard Grant
EFRI 2-DARE: From Atoms to Devices: Pathways to Atomic Layer Optoelectronics via Multi-Scale Imaging and Spectroscopy
EFRI 2-DARE:从原子到设备:通过多尺度成像和光谱学通往原子层光电子学的途径
- 批准号:
1542747 - 财政年份:2015
- 资助金额:
$ 40万 - 项目类别:
Standard Grant
Tailoring Light-Matter Interaction in Plasmonic Nanostructures based on Epitaxial Metallic Films: From Classical to Quantum Regime
基于外延金属薄膜的等离激元纳米结构中的光与物质相互作用的定制:从经典到量子体系
- 批准号:
1306878 - 财政年份:2013
- 资助金额:
$ 40万 - 项目类别:
Continuing Grant
CAREER: Quantum Dynamics in Nanostructures by Design
职业:纳米结构中的量子动力学设计
- 批准号:
0747822 - 财政年份:2008
- 资助金额:
$ 40万 - 项目类别:
Continuing Grant
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