CAREER: Few-Body Universality Study Using Ultracold Atoms in Optical Lattices

职业：在光学晶格中使用超冷原子进行少体普遍性研究

• 批准号: 0747907
• 负责人: Cheng Chin
• 金额: $ 47.01万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0747907&HistoricalAwards=false
• 关键词: CAREER; Few; Body; Universality; Study

This CAREER award aims to identify and explore the universality of quantum systems with a specific number of ultracold atoms. "Universal" behavior occurs at low temperatures when the physical properties of a system depend only on a single parameter, called the two-body scattering length. The implications of universality are understood in the two-body and many-body limits where they describe, for example energy shifts and cross sections in two-atom collisions and the mean-field energy of a Bose-Einstein condensate. The goal of this project is answering the question of how universality persists in few-body systems and link the physics of two- and many-body systems. The experiments will be performed with Bosons (Cs) and Fermions (Li) loaded into two-dimensional optical lattices from quantum degenerate gases. The optical lattice will be a thin layer of two-dimensional lattice sites formed by intersecting five laser beams. The project will use a novel interferometric detection of two- and three-body interactions by probing the evolution of quantum superpositions of atoms in the optical lattice sites.Because of universality these experiments will provide an unprecedented testing ground to investigate fundamental issues in nuclear, condensed matter physics and in physical chemistry. The project also includes a strong education component to train research personnel, and provide research projects for undergraduate and high school students. The project will also support interaction of the PI with the recently created Woodlawn High School in Chicago through the PIs Science Mathematics and Research Training (SMART) program to strengthen the curriculum and motivate interest in science and mathematics.

这一职业奖旨在识别和探索具有特定数量的超冷原子的量子系统的普适性。在低温下，当一个系统的物理性质只取决于一个被称为两体散射长度的参数时，就会出现“普适”行为。普适性的含义在两体和多体极限中得到理解，例如，它们描述了两个原子碰撞中的能量移动和截面，以及玻色-爱因斯坦凝聚体的平均场能量。这个项目的目标是回答这样一个问题，即普适性如何在少体系统中持续存在，并将两体系统和多体系统的物理学联系起来。这些实验将用来自量子简并气体的玻色子(Cs)和费米子(Li)加载到二维光学晶格中进行。光学晶格将是由五束激光相交形成的一层薄薄的二维晶格点。该项目将使用一种新的干涉检测方法，通过探测光学晶格中原子的量子叠加演化来探测两体和三体相互作用。由于这些实验的普遍性，这些实验将为研究核、凝聚态物理和物理化学中的基本问题提供一个前所未有的试验场。该项目还包括一个强大的教育组成部分，以培养研究人员，并为本科生和高中生提供研究项目。该项目还将通过PI科学、数学和研究培训(SMART)计划支持PI与最近在芝加哥创建的伍德劳恩高中的互动，以加强课程设置并激发人们对科学和数学的兴趣。