Instituto Carlos I de Física Teórica y Computacional and Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-18071 Granada, Spain.
Phys Rev Lett. 2009 Oct 30;103(18):185302. doi: 10.1103/PhysRevLett.103.185302. Epub 2009 Oct 28.
We investigate the many-body quantum states of a laser-driven gas of Rydberg atoms confined to a large spacing ring lattice. If the laser driving is much stronger than the van der Waals interaction among the Rydberg atoms, these many-body states are collective fermionic excitations. The first excited state is a spin wave that extends over the entire lattice. We demonstrate that our system permits us to study fermions in the presence of disorder although no external atomic motion takes place. We analyze how this disorder influences the excitation properties of the fermionic states. Our work shows a route towards the creation of complex many-particle states with atoms in lattices.
我们研究了被限制在大间距环晶格中的激光驱动的里德堡原子气体的多体量子态。如果激光驱动远强于里德堡原子之间的范德瓦尔斯相互作用，这些多体态就是集体费米子激发。第一激发态是一个扩展到整个晶格的自旋波。我们证明，尽管没有发生外部原子运动，我们的系统也可以让我们在存在无序的情况下研究费米子。我们分析了这种无序如何影响费米子态的激发性质。我们的工作展示了一种在晶格中用原子创造复杂多粒子态的途径。
