Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS; 4 Place Jussieu, F-75005 Paris, France.
Phys Rev Lett. 2010 Aug 27;105(9):090601. doi: 10.1103/PhysRevLett.105.090601. Epub 2010 Aug 23.
Using a three-frequency one-dimensional kicked rotor experimentally realized with a cold atomic gas, we study the transport properties at the critical point of the metal-insulator Anderson transition. We accurately measure the time evolution of an initially localized wave packet and show that it displays at the critical point a scaling invariance characteristic of this second-order phase transition. The shape of the momentum distribution at the critical point is found to be in excellent agreement with the analytical form deduced from the self-consistent theory of localization.
利用冷原子气体实验实现的三频一维受迫转子，我们研究了金属-绝缘体安德森相变临界点的输运性质。我们精确测量了初始局域波包的时间演化，并表明它在临界点表现出与这个二级相变特征的标度不变性。在临界点处动量分布的形状与从局域化的自洽理论推导出的解析形式非常吻合。
