Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany.
Phys Rev Lett. 2012 May 18;108(20):205301. doi: 10.1103/PhysRevLett.108.205301. Epub 2012 May 14.
The concept of valence-bond resonance plays a fundamental role in the theory of the chemical bond and is believed to lie at the heart of many-body quantum physical phenomena. Here we show direct experimental evidence of a time-resolved valence-bond quantum resonance with ultracold bosonic atoms in an optical lattice. By means of a superlattice structure we create a three-dimensional array of independent four-site plaquettes, which we can fully control and manipulate in parallel. Moreover, we show how small-scale plaquette resonating valence-bond (RVB) states with s- and d-wave symmetry can be created and characterized. We anticipate our findings to open the path towards the creation and analysis of many-body RVB states in ultracold atomic gases.
价键共振的概念在化学键理论中起着基本作用，被认为是许多体量子物理现象的核心。在这里，我们通过超晶格结构在光学晶格中用玻色原子直接展示了时间分辨价键量子共振的实验证据。我们创建了一个独立的四格 plaquette 的三维阵列，可以并行地对其进行完全控制和操作。此外，我们展示了如何创建和表征具有 s 波和 d 波对称性的小尺寸 plaquette 共振价键（RVB）态。我们预计我们的发现将为在超冷原子气体中创建和分析多体 RVB 态开辟道路。
