The Nanoscale Effects of Intrinsic and Externally-Applied Strain on Charge Density Wave States

内在和外部施加的应变对电荷密度波态的纳米级影响

基本信息

  • 批准号:
    1904918
  • 负责人:
  • 金额:
    $ 42.71万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2019
  • 资助国家:
    美国
  • 起止时间:
    2019-08-01 至 2024-07-31
  • 项目状态:
    已结题

项目摘要

Non-technical abstract:Charge density wave states occur in numerous materials where, below a certain "transition" temperature, there is a periodic lattice distortion, and a periodic variation in electron density is established across the material. The electronic properties of the material are altered from the material's original, undistorted state. Charge density wave-hosting materials have been targeted for potential use in electronic devices (such as switches, ion field-effect transistors, and logic circuits). However, there is currently an incomplete understanding as to 1) the origin of charge density wave states, as well as 2) how these states coexist/interact with other technologically-important material properties such as superconductivity or magnetism. Strain engineering is an emerging field in which the application of strain to materials is used to manipulate their optical, electronic, and structural properties. In this project, controlled strain is applied to materials hosting charge density wave states, so as to compress, stretch, or shear the materials, leading to changes in their properties. Scanning tunneling microscopy, a technique which can detail electronic and structural changes in a material on the atomic scale, is used to, simultaneously, detail the evolution of charge density wave states under, both, varying strain and temperature conditions. An overarching goal of the project is to develop a fundamental understanding of the physics governing these compounds. An understanding of how to effectively manipulate their properties in a controlled fashion, is essential for optimizing their performance in devices. This project enhances the education of undergraduate- and graduate-student participants who are developing essential skills with applications in research, industry, and beyond. In addition, mini-classes using experimental techniques such as scanning tunneling microscopy, atomic force microscopy, and scanning electron microscopy, are being developed and incorporated into established, STEM-focused local outreach programs. In particular, these classes will expose precollege students to cutting-edge experimental techniques, providing a unique experience and opportunity for these students to become interested and engaged in STEM fieldsTechnical abstract:Charge density wave (CDW) states are prevalent in condensed matter systems where they are often found to coexist with other orders. The nature of the interplay of CDW states with quantum orders, such as superconductivity and magnetism, particularly on the nanoscale, is complex and not well-understood. In addition, CDW states can have differing and not always well-established origins, further complicating this understanding. Studies of CDW-hosting compounds demonstrate that strain can alter an array of CDW properties, including changing the transition temperature, altering electronic and structural periodicities of the CDW state, and changing the associated electronic band gap. The overarching goals of this NSF project are to understand 1) how strain drives these CDW changes on the atomic-scale, and 2) how to manipulate these changes in a controlled fashion using externally-applied strain. To do this, temperature-dependent scanning tunneling microscopy is used to probe the nanoscale structural and electronic properties of charge density wave states, their formation, their manipulation, and their interplay with coexisting quantum orders, under quantifiable and varied strained conditions. In order to study fundamental differences strain has on CDW states arising from differing origins (for example, Fermi surface nesting versus momentum-dependent electron-phonon coupling), compounds from three well-known, distinct, CDW-hosting families are studied: the blue bronzes, transition metal dichalcogenides, and the rare-earth tellurides. This project supports the research education of graduate and undergraduate students through their participation in all aspects of the project. Furthermore, in an effort to extend science education to precollege students who are historically underrepresented in the sciences (precollege girls and students from the many lower-income households in the local community), the principal investigator is developing mini-classes on "probing material properties" which utilizes Clark facilities to expose area students to the basics of materials research. These classes will be held in connection with established, STEM-focused outreach collaborations involving local area middle and high school students.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:电荷密度波态出现在许多材料中,其中,在特定的“转变”温度以下,存在周期性的晶格扭曲,并且在整个材料中建立了电子密度的周期性变化。材料的电子性质从材料的原始、未扭曲的状态改变。电荷密度波承载材料已成为电子设备(如开关、离子场效应晶体管和逻辑电路)潜在用途的目标。然而,对于1)电荷密度波态的起源,以及2)这些态如何与超导或磁性等其他重要的技术性质共存/相互作用,目前还没有完全的了解。应变工程是将应变应用于材料以操纵其光学、电学和结构性质的新兴领域。在本项目中,对具有电荷密度波态的材料施加控制应变,以压缩、拉伸或剪切材料,从而导致其性质的变化。扫描隧道显微镜是一种可以在原子尺度上详细描述材料中电子和结构变化的技术,它被用来同时详细描述在不同应变和温度条件下电荷密度波态的演变。该项目的一个首要目标是对支配这些化合物的物理学有一个基本的了解。了解如何以受控方式有效地操作它们的特性,对于优化它们在设备中的性能至关重要。这个项目加强了本科生和研究生参与者的教育,他们正在通过在研究、工业和其他领域的应用来发展基本技能。此外,正在开发使用扫描隧道显微镜、原子力显微镜和扫描电子显微镜等实验技术的迷你课程,并将其纳入既定的、以STEM为重点的地方推广计划。特别是,这些课程将使大学预科学生接触到尖端的实验技术,为这些学生提供一个独特的经验和机会,使他们对STEM领域产生兴趣和从事STEM领域。技术摘要:电荷密度波(CDW)态普遍存在于凝聚态系统中,在那里它们经常被发现与其他顺序共存。CDW态与量子秩序,如超导和磁性,特别是在纳米尺度上相互作用的性质是复杂的,还没有被很好地理解。此外,CDW州可能有不同的、但并不总是确定的起源,这进一步复杂化了这种理解。对CDW宿主化合物的研究表明,菌株可以改变CDW的一系列性质,包括改变CDW的转变温度,改变CDW状态的电子和结构周期,以及改变相关的电子带隙。这个NSF项目的首要目标是了解1)应变如何在原子尺度上驱动这些CDW变化,以及2)如何使用外部施加的应变以受控的方式操纵这些变化。为此,我们使用温度相关的扫描隧道显微镜来探测电荷密度波态的纳米结构和电子性质、它们的形成、它们的操纵以及它们与共存的量子有序在可量化和可变应变条件下的相互作用。为了研究应变对不同来源(例如,费米表面嵌套和动量依赖的电子-声子耦合)产生的CDW态的根本差异,我们研究了三个著名的、不同的CDW宿主家族的化合物:蓝色青铜、过渡金属二卤化物和稀土碲化物。该项目通过研究生和本科生参与该项目的各个方面来支持他们的研究教育。此外,为了将科学教育扩展到在科学领域历来缺乏代表性的大学预科学生(大学预科女孩和来自当地社区许多低收入家庭的学生),首席调查员正在开发“探索材料特性”的迷你课程,利用克拉克的设施让该地区的学生接触材料研究的基础知识。这些课程将与当地初中和高中生参加的以STEM为重点的既定外展合作有关。该奖项反映了NSF的法定使命,并通过使用基金会的智力优势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(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Interplay of charge density wave states and strain at the surface of CeTe2
  • DOI:
    10.1103/physrevb.101.245423
  • 发表时间:
    2019-11
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    Bishnu Sharma;M. Singh;Burhan Ahmed;Boning Yu;P. Walmsley;I. Fisher;M. Boyer
  • 通讯作者:
    Bishnu Sharma;M. Singh;Burhan Ahmed;Boning Yu;P. Walmsley;I. Fisher;M. Boyer
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Michael Boyer其他文献

Optimizing the erythromycin breath test for use in cancer patients.
优化用于癌症患者的红霉素呼气测试。
  • DOI:
  • 发表时间:
    2000
  • 期刊:
  • 影响因子:
    11.5
  • 作者:
    L. Rivory;Kellie A. Slaviero;J. Seale;Janelle M. Hoskins;Michael Boyer;Philip Beale;M. Millward;James F. Bishop;Stephen Clarke
  • 通讯作者:
    Stephen Clarke
P3.02b-044 Afatinib versus Gefitinib as First-Line Treatment for EGFR Mutation-Positive NSCLC Patients Aged ≥75 Years: Subgroup Analysis of LUX-Lung 7: Topic: EGFR Clinical
  • DOI:
    10.1016/j.jtho.2016.11.1711
  • 发表时间:
    2017-01-01
  • 期刊:
  • 影响因子:
  • 作者:
    Keunchil Park;Eng Huat Tan;Li Zhang;Vera Hirsh;Ken O'Byrne;Michael Boyer;James Chih-Hsin Yang;Tony Mok;Barbara Peil;Angela Märten;Luis Paz-Ares
  • 通讯作者:
    Luis Paz-Ares
P1.34: First-Line Afatinib vs Gefitinib for Patients With EGFR Mutation-Positive Non-Small-Cell Lung Cancer: The LUX-Lung 7 Trial: Track: Advanced NSCLC
  • DOI:
    10.1016/j.jtho.2016.08.056
  • 发表时间:
    2016-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Santiago Ponce Aix;Keunchil Park;Eng-Huat Tan;Kenneth O’Byrne;Li Zhang;Michael Boyer;Tony Mok;Vera Hirsh;James Chih-Hsin Yang;Angela Märten;Luis Paz-Ares
  • 通讯作者:
    Luis Paz-Ares
A Loss of Function of the Mitochondrial Branched-Chain Aminotransferase (BCATm) Leads to Increased Glycolytic and Oxidative Metabolism in Activated CD4+ T Cells
  • DOI:
    10.1093/cdn/nzaa068_002
  • 发表时间:
    2020-06-01
  • 期刊:
  • 影响因子:
  • 作者:
    Elitsa Ananieva;Ashley Toress;Jonathan Powell;Susan Hutson;Michael Boyer
  • 通讯作者:
    Michael Boyer
An auxiliary capacitor based ultrafast drive circuit for shear piezoelectric motors.
用于剪切压电电机的基于辅助电容器的超快驱动电路。
  • DOI:
    10.1063/1.3213619
  • 发表时间:
    2009
  • 期刊:
  • 影响因子:
    1.6
  • 作者:
    Kamalesh Chatterjee;Michael Boyer;W. D. Wise;Eric R. Hudson
  • 通讯作者:
    Eric R. Hudson

Michael Boyer的其他文献

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