Potassium Atoms in 2D Triangular Superlattice

二维三角形超晶格中的钾原子

• 批准号: 2309300
• 负责人: Dan Stamper-Kurn
• 金额: $ 68.75万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2309300&HistoricalAwards=false
• 关键词: Potassium; Atoms; 2D; Triangular; Superlattice

Advanced technologies are fueled by advances in our understanding of materials. Given that a material is composed of a specific selection of atomic elements in a specific crystalline form, we seek to understand what are the macroscopic properties of the material in terms of electrical and heat conduction, magnetization, and so on. This understanding is often obtained from numerical simulation. However, a new paradigm is emerging for the exploration of materials science: quantum simulation. In this new approach, properties of a material are understood by creating a physical simulacrum of the material, i.e. a highly controlled system that obeys the same microscopic rules as those governing the real material, but a system in which physical properties can be readily tuned and measured. In this project, the research team will simulate the properties of materials using a gas of potassium atoms, cooled to extremely low temperatures, and trapped within a regular structure produced at the intersection of several laser beams (an optical lattice). The motion of the ultracold gas of atoms in this optical lattice mimics the motion of electrons in a crystal. By taking high-resolution images of the atomic gas, the team will gain insight that can guide the design of new materials. Students engaged in the project will receive valuable training in the expanding field of quantum information science. The specific scientific focus of this project is the role of geometric frustration and flat bands in artificial ultracold atomic and also solid state materials. Ultracold potassium atoms will be placed within optical lattices of several geometries, including the honeycomb lattice and the kagome lattice. Both these lattices support a band structure that includes flat bands, i.e. a macroscopic degeneracy of states in which the energy does not vary with quasi-momentum. The team will conduct experiments using the fermionic isotope of potassium, 40-K, in order to probe and verify the flatness of these bands, explore the implication of flat bands on the thermodynamics of itinerant fermions, and study the possibility of metallic, ferromagnetic, charge-density-wave modulated, and superconducting states of fermions in flat-band optical lattices. The findings of this work will advance our knowledge of complex electronic phases that arise in flat-band and heavy-fermion materials.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.

我们对材料的理解的进步推动了先进的技术。 鉴于材料由特定晶体形式的特定原子元素选择组成，我们试图了解材料的宏观特性，从电气和热传导，磁化等方面。 这种理解通常是从数值模拟获得的。 然而，探索材料科学的新范式正在出现：量子模拟。 在这种新方法中，通过创建材料的物理模拟来理解材料的属性，即高度控制的系统，它遵守与管理真实材料的材料相同的显微镜规则，但是可以轻松地调整和测量物理属性的系统。 在该项目中，研究团队将使用钾原子的气体模拟材料的性质，冷却至极低的温度，并将其捕获在几个激光束（光学晶格）交点处产生的常规结构中。 在该光学晶格中，原子的超速气体的运动模仿了晶体中电子的运动。 通过拍摄原子气的高分辨率图像，该团队将获得可以指导新材料设计的见解。 从事该项目的学生将接受量子信息科学扩展领域的宝贵培训。该项目的特定科学重点是几何挫败感和扁平带在人工超低原子和固态材料中的作用。 Ultrocold钾原子将放置在几个几何形状的光学晶格中，包括蜂窝状晶格和Kagome晶格。 这两个晶格都支持一个带有扁平频段的频带结构，即能量不随准摩托车而变化的状态的宏观堕落。 该团队将使用钾（40-k）的费尔米离子同位素进行实验，以探测和验证这些频段的平坦度，探索平面带对静脉效应的热力学的意义，并研究金属，富集，电荷，电荷密度，电荷密度调节的调节和超级模型的可能性。 这项工作的发现将提高我们对平坦和重型屈光度材料中出现的复杂电子阶段的了解。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。