周期驱动冷原子系统中的拓扑量子态及其性质研究

项目名称： 周期驱动冷原子系统中的拓扑量子态及其性质研究

项目编号： No.11247011

项目类型： 专项基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 刘国才

作者单位： 河北科技大学

项目金额： 20万元

中文摘要： 拓扑量子态是目前凝聚态系统领域的一个研究热点，而冷原子系统因其在几何结构、维度、相互作用等方面的可控性，被看作研究凝聚态物理问题的理想平台。冷原子系统中人工规范场理论的提出和实验的成功极大的推动了冷原子拓扑量子态的研究。然而，最近的研究表明，在一个静态系统中，施加一个合适的具有时间周期性的势，也可以产生拓扑量子相变。本项目将致力于研究在周期驱动的冷原子系统中实现拓扑量子相变的方案。目前，在冷原子系统中，这方面的研究还很少。具体的我们将研究以下两个方面的内容：在周期驱动的冷原子系统中，搜寻可能的拓扑量子相变方案；研究周期驱动的冷原子系统中，原子间的相互作用、规范场和轨道自由度之间的相互作用及其对系统拓扑性质的影响。预期通过这些研究将揭示一些新奇的拓扑量子现象，确定它们的物理机制，以期对体系的量子态有全面的认识。

中文关键词： 光晶格；冷原子；规范场；拓扑绝缘体；自旋轨道耦合

英文摘要： The cold atoms system has gradually become a platform to study a lot of phenomena in condensed matter physics because its parameters could be adjusted easily through experimental methods such as adjusting the depth of potential well by changing light intensity and the symmetry and size of lattice through varying the space distribution of laser beam. On the other hand, it is developed very rapidly in the direction to explore novel quantum states, such as the theoretical prediction and experimental verification of topological insulators in some semiconductor materials, and novel quantum spin states in strongly correlated electron systems. Topological properties of electron bands and its application to quantum transport focused a lot of attentions in the field of condensed matter physics. The project will make use of the cold atoms system to simulate and to research quantum phenomena in many-body interacting system. In 2009，the Spielman’s group of NIST in America creates effective Abelian gauge potential in an 87Rb Bose-Einstein condensate by use of the light-induced gauge field. In 2011, they create spin-orbit coupling through non-Abelian gauge potential techniques in same system. The huge success of the gauge field experiment in cold atom system makes it possible to investigate a variety of physics phenomena indu

英文关键词： optical lattice；cold atoms；gauge field；topological insulators；spin-orbit coupling