项目名称: 掺杂超冷原子气体的低能激发
项目编号: No.11205071
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 物理学II
项目作者: 周昱
作者单位: 江苏科技大学
项目金额: 22万元
中文摘要: 本项目基于超流体序参量方程和波戈留波夫方法,利用奇异摄动方法、变分法、密度泛函分析等手段深入研究掺杂超冷原子气体的低能激发性质。主要包括:(1)玻色和费米原子气体的掺杂低能激发谱;(2)各种低能激发模式间的耦合;(3)有限温度效应下的掺杂原子气体的低能激发谱,以及激发谱和粒子间相互作用、掺杂浓度、外势的各向异性参数、囚禁频率等参量之间的关系。通过项目开展,预期对具有掺杂的超冷原子气体低能激发具有全面深入了解,为掺杂超冷原子气体相关实验工作提供有益理论指导,并有助于系统理解超冷原子气体的超流特性和物质波相干特性。
中文关键词: 超冷量子气体;玻色-爱因斯坦凝聚;超流费米气体;元激发;
英文摘要: Based on superfluid order-parameter equation and Bogoliubov method, in this project, we use singular perturbation method, variational method, and density functional method to investigate the low-energy excitations of impurity ultracold atom gases, including Bose and Fermi gases. The main research contents are: (1) low-energy excitations of impurity Bose and Fermi gases; (2)coupling and nonlinear interactions of different excitation modes of the system; (3) finite-temperature effect of the excitation spectra of impurity gases, and the relations between the spectra and inter-atomic interaction parameter, impurity density, anisotropic parameter and trapping frequencies of external trapping potentials. It is of important to study the low-energy excitations of impurity atom gases, and we hope our investigation can give some useful guides to the experiments related to this field, we also expect our results about the low-energy excitations of impurity atom gases will be helpful to the deep understanding of the superfluidity and macroscopic coherent properties of ultracold atom gases.
英文关键词: ultracold quantum gas;Bose-Einstein condensation;superfluid Fermi gas;elementary excitation;