Strongly Correlated Physics in an Atomic Fermi Gas

这个实验研究计划将继续研究BCS/BEC交叉处的强相互作用费米子，通过分子光谱探测多体量子态，并通过研究气体中的量子化涡旋。光学晶格可以用来模拟许多低维凝聚态系统。低能激发以准粒子为特征，其中自旋和电荷激发解耦并以不同的速度传播。该小组将使用二维光学晶格，创建一种由Li-6原子的双组分混合物组成的Luttinger液体，并在其激发过程中寻找自旋和电荷自由度的分离。最后，他们将研究Li-6费米子和Li-7玻色子通过Feshbach共振相互作用的混合物中的量子相变。该方案的更广泛影响包括加强对实际材料的了解，这些材料可能是成功实施拟议目标的结果。

This experimental research program will continue studies of strongly interacting fermions at the BCS/BEC crossover by probing the many-body quantum state via molecular spectroscopy, and by studying quantized vortices in the gas. Optical lattices can be used to model many of the lower dimension condensed matter systems. The low energy excitations are characterized by quasi-particles in which the spin and charge excitations decouple and propagate at different velocities. The group will create a Luttinger liquid of a two-component mixture of Li-6 atoms, using a two-dimensional optical lattice, and to look for a separation of the spin and charge degrees of freedom in its excitations. Finally, they will study a quantum phase transition in a mixture of Li-6 fermionic atoms and Li-7 bosons interacting via a Feshbach resonance. The broader impact of the program involves the enhanced understanding of real materials that may result from the successful implementation of the proposed objectives.