Brillouin Light Scattering Studies of Two-Dimensional Layered Materials Systems

二维层状材料系统的布里渊光散射研究

• 批准号: RGPIN-2015-04306
• 负责人: Andrews, Gordon
• 金额: $ 1.6万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708472
• 关键词: Brillouin; Light; Scattering; Studies; Two

Two-dimensional layered materials are the mille-feuille pastries of Condensed Matter Physics.  Like their edible analogs, these materials consist of weakly bound layers and exist in many different varieties, all of which have unique and interesting attributes.  Exploration and characterization of the properties of two-dimensional layered systems, however, is in its infancy, due mainly to their novelty and the limited number of analytical techniques capable of unintrusively probing the often fragile structures. In particular, there have been very few studies of the collective motions of the atoms that make up these materials - so-called 'acoustic phonons' - and those that have been done were carried out on a limited material set. Furthermore, the relationships between the mechanical properties and other important material properties have not been established. The research program that I plan to pursue at Memorial University will utilize an optical technique known as Brillouin spectroscopy to probe acoustic phonon behaviour in a variety of bulk and ultrathin two-dimensional layered materials with the aim of understanding the interplay between the mechanical, structural, and electronic properties of these systems.  This knowledge is critical to the development and refinement of theoretical models of phonon-related phenomena in layered materials, and for understanding the interaction between electrons and phonons in extremely thin systems.  From a technological perspective, the breadth and quantitative nature of the information obtained from the proposed research will serve as a mechanical properties database and as a reference platform for phonon engineering in these industrially-relevant materials systems. Moreover, knowledge of the mechanical properties of these materials is key to their anticipated adoption in new flexible electronic and optomechanical devices, and in alternate energy technologies that utilize elastic energy storage.

二维层状材料是凝聚态物理学中的千层酥饼。与它们的可食用类似物一样，这些材料由弱结合层组成，存在于许多不同的种类中，所有这些都具有独特而有趣的属性。然而，对二维层状系统性质的探索和表征仍处于起步阶段，这主要是由于它们的新奇以及能够非侵入性地探测通常脆弱的结构的分析技术的数量有限。特别是，很少有研究构成这些材料的原子的集体运动-所谓的“声学声子”-并且那些已经完成的都是在有限的材料集上进行的。此外，机械性能和其他重要材料性能之间的关系尚未建立。我计划在纪念大学从事的研究项目将利用一种称为布里渊光谱的光学技术来探测各种大块和超薄二维分层材料中的声学声子行为，目的是了解机械、结构、这些知识对声子理论模型的发展和完善至关重要，从技术的角度来看，从拟议的研究中获得的信息的广度和定量性质将作为一个机械性能数据库，并作为这些工业相关材料系统中声子工程的参考平台。 此外，这些材料的机械性能的知识是关键，他们预期采用新的柔性电子和光学机械设备，并在替代能源技术，利用弹性储能。