Excellence in Research:Single Crystal Growth and Investigation of Novel Exotic Fermion Materials

卓越的研究：单晶生长和新型奇异费米子材料的研究

• 批准号: 1832031
• 负责人: Doyle Temple
• 金额: $ 99.96万
• 依托单位: Norfolk State University
• 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: 2018-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1832031&HistoricalAwards=false
• 关键词: Excellence; Research; Single; Crystal; Growth

Non-technical Summary:The electronic devices we use today operate by controlling the motion of negatively charged electrons, known as an electric current, through a material by applying a voltage. However, electrons possess not only an electric charge but also a property known as their intrinsic spin, which is analogous to a spinning top. This has led to the development of electronic devices that function by exploiting both the charge and the spin of electrons in a new form of electricity known as spintronics. Although still in its infancy, this field of spintronics has far reaching potential in applications such as ultra-low power electronics and quantum computing. Recently, a new class of materials, known as fermion materials, topological insulators and semimetals, or just quantum materials, were discovered which allow electronic currents to be controlled using both charge and spin. As part of this Excellence in Research project, supported by the National Science Foundation, a new, strategic partnership between the Department of Physics at Norfolk State University (NSU) and the 2D Crystal Consortium-Materials Innovation Platform (2DCC-MIP) at Pennsylvania State University has been formed. The collaboration between the two groups leverages their respective unique capabilities in single crystal growth, materials characterization, and modeling into a team focused on the discovery of new Weyl semimetals, which are specific solid state crystals that are good candidates for quantum materials. Additionally, this project also strengthens education and training in the field of growth of crystalline materials, the importance of which was highlighted in the National Research Council's report "Frontiers in Crystalline Matter." By providing students with in-depth research training in the NSU Department of Physics and in 2DCC-MIP at Penn State this research has a significant impact on the education, research training, and professional development of at least nine undergraduate physics majors and a graduate student in material science, that are all underrepresented in STEM fields.Technical Summary:Topological fermions such as Dirac and Weyl fermions in condensed matter are not only of fundamental importance, but also carry great promise for information technology applications. Although 3-, 6- and 8-fold fermions have been predicted in a wide range of materials, these predictions are still awaiting experimental verification. The unavailability of single crystal samples of those proposed candidate materials has slowed the progress in this area. This research partnership addresses this challenge by developing a comprehensive strategy to grow and characterize single crystals of the proposed candidate materials. This approach accelerates discoveries of novel topological materials. The new fermion candidate materials which are of interest include: 1) 3-fold fermions Pd3Bi2S2, Ag3SeAu, A4Pn3 (A=Ca, Sr and Ba; Pn=As, Sb and Bi), R4Pn3 (R=La, Ce; Pn =As, Sb and Bi), and ReRh6Ge4 (Re = Y, La and Lu), 2) 6-fold fermions MgPt, PdAsS, K3BiTe3, Mg3Ru2, FeS2 and PtP2, and 3) 8-fold fermions CuBi2O4, PdBi2O4, PdS, CsSn, CsSi, Ta3Sb, MPd3S4(M=rare earth) and Nb3Bi. Materials characterization the research team uses include magnetotransport, quantum oscillation, and ARPES measurements (performed at 2DCCMIP) and XRD, time resolved reflectivity, and transient grating measurements performed at NSU.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：我们今天使用的电子设备通过施加电压通过材料来控制带负电的电子（称为电流）的运动。但是，电子不仅具有电荷，而且具有称为固有自旋的特性，该特性类似于旋转顶部。这导致了电子设备的开发，该电子设备通过以一种称为Spintronics的新形式利用电子的电荷和旋转来开发。尽管该领域仍处于起步阶段，但在超低功率电子和量子计算等应用中具有很大的潜力。最近，发现了一种新的材料，即被称为费米昂材料，拓扑绝缘子和半学或仅量子材料，可以使用电荷和自旋控制电子电流。作为这项卓越研究项目的一部分，在诺福克州立大学（NSU）物理学系与宾夕法尼亚州立大学的2D水晶财团创新平台（2DCC-MIP）之间建立了新的战略合作伙伴关系。两组之间的合作利用了他们各自的独特能力，以单晶的生长，材料表征和建模为重点是发现新的Weyl Semimetals的团队，这些团队是特定的固态晶体，它们是量子材料的良好候选者。此外，该项目还加强了晶体材料增长领域的教育和培训，其重要性在国家研究委员会的报告“晶体问题的边界”中得到了强调。通过向学生提供NSU物理学系和宾夕法尼亚州立大学2DCC-MIP的深入研究培训，这项研究对至少九个本科物理学专业的教育，研究培训和专业发展具有重大影响重要性，但也对信息技术应用抱有巨大的希望。尽管已经在各种材料中预测了3，6-和8倍的费米子，但这些预测仍在等待实验验证。这些提议的候选材料的单晶样品的不可用降低了该区域的进度。这项研究伙伴关系通过制定一项全面的战略来应对拟议候选材料的单晶的全面战略来应对这一挑战。这种方法加速了新型拓扑材料的发现。 The new fermion candidate materials which are of interest include: 1) 3-fold fermions Pd3Bi2S2, Ag3SeAu, A4Pn3 (A=Ca, Sr and Ba; Pn=As, Sb and Bi), R4Pn3 (R=La, Ce; Pn =As, Sb and Bi), and ReRh6Ge4 (Re = Y, La and Lu), 2) 6-fold fermions MgPt, PDASS，K3BITE3，MG3RU2，FES2和PTP2，以及3）8倍Fermions Cubi2O4，PDBI2O4，PDS，CSSN，CSSN，CSSI，TA3SB，TA3SB，MPD3S4（M =稀土）和NB3BI。 Materials characterization the research team uses include magnetotransport, quantum oscillation, and ARPES measurements (performed at 2DCCMIP) and XRD, time resolved reflectivity, and transient grating measurements performed at NSU.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.

项目成果

Commensurate and incommensurate magnetic structure of the moderately frustrated antiferromagnet Li2M(WO4)2 with M = Co, Ni

M = Co、Ni 的中等受挫反铁磁体 Li2M(WO4)2 的相称和不相称磁结构

• 发表时间: 2021
• 期刊: Physical review
• 作者: Sunil K. Karna, C.-W. Wang

Giant topological Hall effect in centrosymmetric tetragonal Mn2−xZnxSb

• DOI: 10.1103/physrevb.104.174419
• 发表时间: 2021-11
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Md Rafique Un Nabi;A. Wegner;Fei Wang;Yanglin Zhu;Yingdong Guan;A. Fereidouni;K. Pandey;R. Basnet-R