Physics with Ultracold Molecules and Fermionic Atoms

冷原子相互作用和稀薄费米简并原子气体已经成为非常活跃的研究领域。最有趣的新领域之一是量子简并偶极费米子气体的产生。这些气体被预测表现出令人兴奋的新现象，包括偶极诱导的平均场效应，也许，BCS超流性。超冷偶极气体也可以在构建强大的量子计算机中发挥作用。稀费米简并原子气体有许多需要探索的特征。与带电粒子（电子）类似，它们在凝聚态的行为将是多种多样的，并主要取决于它们相互作用的微妙之处。人们对超冷偶极费米系统知之甚少。磁囚禁原子气体的蒸发和感应冷却是研究这类系统的一条很有前途的途径，本研究计划的目标是研究费米原子的磁囚禁和蒸发冷却，冷原子和超冷原子之间的相互作用，以及高磁矩费米简并原子气体的可能产生。这将使用磁性捕获的金属原子（如铬）来实现。光谱学将用于检测捕获的物质。弹性和非弹性碰撞截面的精确测定将提供有关这些系统的重要信息。费米简并将通过激光冷却和蒸发冷却的磁捕获的共存玻色子和费米同位素的组合来追求。

Cold atom interactions and dilute Fermi degenerate atomic gases have become very dynamic areas of research. One of the most intriguing new frontiers is the creation of quantum degenerate dipolar fermionic gases. Such gases are predicted to exhibit exciting new phenomena including dipole-induced mean field effects and, perhaps, BCS superfluidity. Ultracold dipolar gases could also play a role in the construction of a robust quantum computer.Dilute Fermi degenerate atomic gases have numerous features that need to be explored. Similar to their charged particle counterparts (electrons), their behavior in the condensed state will be varied and depend crucially on the subtleties of their interactions. Very little is known about ultracold dipolar Fermi systems. One promising route to the study of such systems is through evaporative and sympathetic cooling of magnetically trapped atomic gases.The goal of this research proposal is to investigate the magnetic trapping and evaporative cooling of Fermionic atoms, the interactions between cold and ultracold atoms, and the possible creation of atomic Fermi degenerate gases with high magnetic moment. This will be accomplished using magnetically trapped metal atoms (such as chromium). Spectroscopy will be used for detection of the trapped species. Precise determination of elastic and inelastic collisional cross sections will provide important information about these systems. Fermi degeneracy will be pursued through a combination of laser cooling and evaporative cooling of magnetically trapped co-resident bosonic and fermionic isotopes.