Nonperturbative methods for studying dressed quasiparticles and their effective interactions in strongly-coupled systems

研究强耦合系统中修饰准粒子及其有效相互作用的非微扰方法

• 批准号: RGPIN-2015-03867
• 负责人: Berciu, Mona
• 金额: $ 4.01万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=589434
• 关键词: Nonperturbative; methods; studying; dressed; quasiparticles

An electron moving through a solid is intimately connected with all of its elementary excitations, such as lattice vibrations, and it drags along, as it moves, a cloud of such possible excitations. This complex entity is called a "dressed quasiparticle". Compared to the original electron, it has a different effective mass and dynamical properties. The interactions between dressed quasiparticles are also very different from those between the original electrons: exchange of excitations between their clouds mediates an effective attraction that may result in superconductivity or other interesting behavior. Understanding the nature of these dressed quasiparticles and their effective interactions, and their combined effect on the physical properties of the solid, are fundamental questions that drive a lot of the modern research in theoretical condensed matter and materials physics.

一个电子在固体中的运动与它的所有基本激发（如晶格振动）密切相关，而且它在运动时会拖着沿着一团这种可能的激发。这种复杂的实体被称为“着装准粒子”。与原始电子相比，它具有不同的有效质量和动力学性质。修饰后的准粒子之间的相互作用也与原始电子之间的相互作用非常不同：它们的云之间的激发交换介导了一种有效的吸引力，可能导致超导性或其他有趣的行为。理解这些修饰准粒子的性质及其有效相互作用，以及它们对固体物理性质的综合影响，是推动理论凝聚态和材料物理学现代研究的基本问题。