Dareau A, Levy E, Aguilera M Bosch, Bouganne R, Akkermans E, Gerbier F, Beugnon J
Laboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL Research University, UPMC-Sorbonne Universités, 11 Place Marcelin Berthelot, 75005 Paris, France.
Department of Physics, Technion Israel Institute of Technology, Haifa 32000, Israel.
Phys Rev Lett. 2017 Nov 24;119(21):215304. doi: 10.1103/PhysRevLett.119.215304. Epub 2017 Nov 22.
Topological properties of crystals and quasicrystals is a subject of recent and growing interest. This Letter reports an experiment where, for certain quasicrystals, these properties can be directly retrieved from diffraction. We directly observe, using an interferometric approach, all of the topological invariants of finite-length Fibonacci chains in their diffraction pattern. We also quantitatively demonstrate the stability of these topological invariants with respect to structural disorder.
晶体和准晶体的拓扑性质是一个近期备受关注且关注度不断上升的课题。本信函报道了一项实验，对于某些准晶体而言，这些性质可直接从衍射中获取。我们采用干涉测量法，在其衍射图样中直接观测到了有限长度斐波那契链的所有拓扑不变量。我们还定量证明了这些拓扑不变量相对于结构无序的稳定性。
