JILA, NIST, and Department of Physics, University of Colorado-Boulder, Boulder, Colorado 80309-0440, USA.
Phys Rev Lett. 2013 Feb 15;110(7):075301. doi: 10.1103/PhysRevLett.110.075301. Epub 2013 Feb 11.
Recent theory has indicated how to emulate tunable models of quantum magnetism with ultracold polar molecules. Here we show that present molecule optical lattice experiments can accomplish three crucial goals for quantum emulation, despite currently being well below unit filling and not quantum degenerate. The first is to verify and benchmark the models proposed to describe these systems. The second is to prepare correlated and possibly useful states in well-understood regimes. The third is to explore many-body physics inaccessible to existing theoretical techniques. Our proposal relies on a nonequilibrium protocol that can be viewed either as Ramsey spectroscopy or an interaction quench. The proposal uses only routine experimental tools available in any ultracold molecule experiment. To obtain a global understanding of the behavior, we treat short times pertubatively, develop analytic techniques to treat the Ising interaction limit, and apply a time-dependent density matrix renormalization group to disordered systems with long range interactions.
最近的理论表明，如何通过超冷极性分子模拟可调谐的量子磁体模型。在这里，我们展示尽管目前的分子光学晶格实验远远低于单位填充和非量子简并，但仍可以实现量子模拟的三个关键目标。第一个是验证和基准化用于描述这些系统的模型。第二个是在充分理解的条件下制备相关且可能有用的状态。第三个是探索现有理论技术无法访问的多体物理。我们的建议依赖于一种非平衡协议，可以将其视为拉姆齐光谱学或相互作用猝灭。该建议仅使用任何超冷分子实验中都可用的常规实验工具。为了全面了解行为，我们对短时间进行微扰处理，开发分析技术来处理伊辛相互作用极限，并对具有长程相互作用的无序系统应用时变密度矩阵重整化群。
