Engineering Strongly Correlated Quantum Phases Through Symmetry Breaking in GNRs

加州大学伯克利分校的Felix Fischer教授得到化学系大分子、超分子和纳米化学项目的支持，开发了一维石墨烯纳米带基量子材料的自下而上合成、纯化和研究。这些合成产品专为与下一代电子产品相关的特定铁磁、金属和超导特性而量身定制。石墨烯纳米带是一类新兴的自下而上合成的设计师量子材料的代表，其电子结构可以通过化学设计以原子精度进行调整。所制造的材料将成为更强大，更紧凑的磁体，低功耗便携式电子设备，量子传感器，加速数据处理系统以及更有效的能量产生，转换和转换技术的新方案的基础。该项目有望简化和加速计算机芯片，同时降低其能源需求。 该项目将在量子材料科学的高度跨学科领域为不同的研究生和本科生群体提供培训。与当地主要是本科院校和湾区科学家在学校（BASIS）计划合作的推广计划旨在扩大代表性不足的少数民族的参与。在这个项目中，Fischer教授和他的学生将为1D极限中强相关相的理性自下而上的设计和合成奠定基础，这是解锁奇异量子材料的关键。在强关联的低维材料中控制量子电子态可能会开启一个低功率高频量子信息处理的新时代，其规模远远超过摩尔定律的预测。对描述非常规形式的高温超导性或实现原子级薄的可切换导线的理论模型进行实验验证，有望简化和加速计算机芯片，同时减少其不断增长的能源需求。Fischer教授和他的团队将利用他们在自下而上合成，定制聚合技术和先进的扫描隧道显微镜（STM）和光谱学（STS）方面的专业知识，合理设计，制造和表征石墨烯纳米带中电子-电子相互作用中出现的奇异量子现象。预期合成产物表现出远远超出母体2D石墨烯的新颖物理性质，例如高度可调的带隙、光电发射、离域自旋态、相干磁自旋链、对称性保护拓扑态，甚至金属带结构，所有这些都由真实的空间结构参数定制，包括宽度、对称性、边缘终止、该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Professor Felix Fischer of the University of California, Berkeley is supported by the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry to develop bottom-up synthesis, purification and investigation of one-dimensional graphene nanoribbon-based quantum materials. The synthetic products are tailored for specific ferromagnetic, metallic and superconducting properties that are relevant to next-generation electronics. Graphene nanoribbons are representatives of an emerging class of bottom-up synthesized designer quantum materials whose electronic structure can be tuned with atomic precision by chemical design. The manufactured materials will be the basis of stronger, yet more compact magnets, new schemes for low-power, portable electronic devices, quantum sensors, accelerated data processing systems, and more efficient energy generation, transduction, and conversion technologies. The project promises to streamline and accelerate computer chips while simultaneously reducing their energy demand. The project will provide training for a diverse group of graduate and undergraduate students in the highly interdisciplinary field of quantum materials science. An outreach plan for collaboration with a local primarily undergraduate institution and the Bay Area Scientist in Schools (BASIS) program is geared towards broadening participation from underrepresented minorities. In this project, Professor Fischer and his students will lay the foundation for the rational bottom-up design and synthesis of strongly correlated phases in the 1D limit that holds the key to unlocking exotic quantum materials. Control of quantum electronic states in strongly correlated low-dimensional materials could ring in a new era of low-power high-frequency quantum information processing that scales far beyond the predictions of Moore’s law. The experimental validation of theoretical models that describe unconventional forms of high temperature superconductivity or the realization of atomically thin switchable wires holds the promise to streamline and accelerate computer chips while simultaneously reducing their growing energy demand. Professor Fischer and his team will leverage their expertise in bottom-up synthesis, custom polymerization techniques, and advanced scanning tunneling microscopy (STM) and spectroscopy (STS) to rationally design, manufacture, and characterize the exotic quantum phenomena emerging form electron-electron interactions in graphene nanoribbons. The synthetic products are expected to exhibit novel physical properties that extend far beyond the parent 2D graphene, such as highly tunable band gaps, photoemission, delocalized spin-states, coherent magnetic spin-chains, symmetry protected topological states, and even metallic band structures, all tailored by real space structural parameters including among others width, symmetry, edge termination, and doping.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.