Princeton Center for Complex Materials

普林斯顿复杂材料中心

• 批准号: 1420541
• 负责人: Ali Yazdani
• 金额: $ 1932.5万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Cooperative Agreement
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-11-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1420541&HistoricalAwards=false
• 关键词: Princeton; Center; Complex; Materials

****Nontechnical abstract****The interdisciplinary research in the MRSEC at Princeton is focused on three directions in materials research. The first exploits recent advances in physics and chemistry to uncover novel "topological" quantum properties of electrons in semiconductors. The research is promising for enabling future electronics with ultralow heat dissipation, and enabling novel approaches to quantum computing. In the second direction, the researchers combine two new technologies that enable the growth of very thin polymer films with specialized physical properties critical for applications in many industries. The third direction seeks to control and manipulate the spin of a single electron trapped in an ultrathin nanowire. Advances will lead to logic elements for quantum computing as well as a new class of broadly tunable lasers. The researchers participate in a broad array of education projects. Each summer, 20 undergraduates, selected from over 400 applicants nationwide, engage in supervised research in preparation for graduate school in science and engineering. In addition, the researchers host 18 high-school and 30 middle-school students from Central High, Trenton, for a rigorous 3-week science-camp (PUMA). The PUMA alumni have achieved a high-school graduation rate of 100%, with most going on to college. In addition, the researchers hold 8 one-day Science fairs each year (some co-organized with the town library) which attract from 300 to 800 K-12 students and their parents to campus. ****Technical abstract****In the first of 3 projects, researchers seek to expand the search for novel topological quantum properties of electrons in insulators, semiconductors and semimetals. Currently, the long-established Bloch theory of crystalline solids is undergoing revision because of topological principles neglected in Bloch theory. Semiconductors in which the energy gap is "inverted" (relative to the atomic limit) exhibit surface states occupied by massless Dirac fermions. Using scanning tunneling microscopy, transport and photoemission experiments, researchers will test key predictions of the new perspective, and search for new topological phases and excitations (e.g. Majorana fermions). In the second project, researchers will apply a laser-ablation technique called MAPLE to grow and investigate ultrathin polymer films deposited under novel conditions that dramatically raise the glass-transition temperature. Combining expertise in fluorescence, nanoscale imaging and simulation, they will address the technologically important issue of why the thermodynamic properties (e.g. the glass transition) of confined polymers differ dramatically from those in bulk polymers. Researchers in the third project will address a challenging problem in the quest for quantum computing, namely how to couple well-separated qubits without losing quantum information. Applying recent advances, they will coherently couple spin qubits using microwave photons trapped in a high-Q superconducting resonator. A serendipitous benefit is the discovery of lasing action. In a parallel effort, experiments to achieve very long spin coherence lifetimes in isotopically pure silicon are proposed.

*非技术摘要*普林斯顿大学MRSEC的跨学科研究集中在材料研究的三个方向。第一个利用物理和化学的最新进展来揭示半导体中电子的新的“拓扑”量子特性。这项研究有望使未来的电子产品具有超低的散热，并使量子计算的新方法成为可能。在第二个方向上，研究人员结合了两种新技术，使非常薄的聚合物薄膜能够生长出具有特殊物理特性的薄膜，这对许多行业的应用至关重要。第三个方向寻求控制和操纵被困在超细纳米线中的单电子的自旋。进展将导致用于量子计算的逻辑元件以及一类新的宽可调激光。研究人员参与了一系列广泛的教育项目。每年夏天，从全国400多名申请者中挑选出20名本科生，进行监督研究，为攻读理工科研究生做准备。此外，研究人员还招待了来自特伦顿中央高中的18名高中生和30名中学生参加为期3周的严格科学夏令营(PUMA)。PUMA的校友实现了100%的高中毕业率，大多数人都上了大学。此外，研究人员每年举办8次为期一天的科学博览会(有些是与镇图书馆联合举办的)，吸引了300到800名K-12学生和他们的家长来到校园。在三个项目中的第一个项目中，研究人员寻求扩大对绝缘体、半导体和半金属中电子的新的拓扑量子性质的搜索。目前，由于布洛赫理论忽略了拓扑学原理，长期以来形成的布洛赫晶体固体理论正在进行修正。能隙“反转”(相对于原子极限)的半导体呈现出被无质量狄拉克费米子占据的表面态。利用扫描隧道显微镜、输运和光电子实验，研究人员将测试新视角的关键预测，并寻找新的拓扑相和激发(例如Majorana费米子)。在第二个项目中，研究人员将应用一种名为Maple的激光烧蚀技术来生长和研究在显著提高玻璃化转变温度的新条件下沉积的超薄聚合物薄膜。他们将结合荧光、纳米成像和模拟方面的专业知识，解决为什么受限聚合物的热力学性质(例如玻璃化转变)与本体聚合物的热力学性质显著不同这一技术上的重要问题。第三个项目的研究人员将解决量子计算探索中的一个具有挑战性的问题，即如何在不丢失量子信息的情况下将分离良好的量子比特耦合起来。应用最近的进展，他们将利用高Q超导谐振器中捕获的微波光子来相干耦合自旋量子比特。一个偶然的好处是激光作用的发现。在一个平行的努力中，提出了在同位素纯硅中实现非常长的自旋相干寿命的实验。

项目成果

Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

• DOI: 10.1038/s41586-019-1422-x
• 发表时间: 2019-08-01
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Xie, Yonglong;Lian, Biao;Yazdani, Ali
• 通讯作者: Yazdani, Ali

Designing the Morphology of Separated Phases in Multicomponent Liquid Mixtures

设计多组分液体混合物中分离相的形态

• DOI: 10.1103/physrevlett.125.218003
• 发表时间: 2020
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Mao, Sheng;Chakraverti-Wuerthwein, Milena S.;Gaudio, Hunter;Košmrlj, Andrej
• 通讯作者: Košmrlj, Andrej

Cascade of electronic transitions in magic-angle twisted bilayer graphene

• DOI: 10.1038/s41586-020-2339-0
• 发表时间: 2020-06-01
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Wong, Dillon;Nuckolls, Kevin P.;Yazdani, Ali
• 通讯作者: Yazdani, Ali

Observation of backscattering induced by magnetism in a topological edge state

• DOI: 10.1073/pnas.2005071117
• 发表时间: 2020-07-14
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Jack, Berthold;Xie, Yonglong;Yazdani, Ali
• 通讯作者: Yazdani, Ali

Tuning interactions between spins in a superconductor

• DOI: 10.1073/pnas.2024837118
• 发表时间: 2021-04-06
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Ding, Hao;Hu, Yuwen;Yazdani, Ali
• 通讯作者: Yazdani, Ali