See Toh Jun Hui, Du Mengxin, Tang Xinxin, Su Ying, Rojo Tristan, Patterson Carson O, Williams Nicolas R, Zhang Chuanwei, Gupta Subhadeep
Department of Physics, <a href="https://ror.org/00cvxb145">University of Washington</a>, Seattle, Washington, USA.
Department of Physics, <a href="https://ror.org/049emcs32">The University of Texas at Dallas</a>, Richardson, Texas, USA.
Phys Rev Lett. 2024 Aug 16;133(7):076301. doi: 10.1103/PhysRevLett.133.076301.
Understanding the interplay of interaction and disorder in quantum transport poses long-standing scientific challenges for theory and experiment. While highly controlled ultracold atomic platforms combining atomic interactions with spatially disordered lattices have led to remarkable advances, the extension of such controlled studies to phenomena in high-dimensional disordered systems, such as the three-dimensional Anderson metal-insulator transition has been limited. Kicked quantum gases provide an alternate experimental platform that captures the Anderson model in momentum space and features dynamical localization as the analog of Anderson localization. Here, we utilize a momentum space lattice platform using quasiperiodically kicked ultracold atomic gases to experimentally investigate interaction effects on the three-dimensional dynamical Anderson metal-insulator transition. We observe interaction-driven subdiffusion and a divergence of delocalization onset time on approaching the phase boundary. Mean-field numerical simulations show qualitative agreement with experimental observations, but with significant quantitative deviations.
理解量子输运中相互作用与无序之间的相互作用，对理论和实验提出了长期存在的科学挑战。虽然将原子相互作用与空间无序晶格相结合的高度可控超冷原子平台已取得显著进展，但将此类可控研究扩展到高维无序系统中的现象，如三维安德森金属-绝缘体转变，仍受到限制。受驱量子气体提供了一个替代实验平台，它在动量空间中捕捉安德森模型，并具有作为安德森局域化类似物的动力学局域化特征。在此，我们利用准周期受驱超冷原子气体的动量空间晶格平台，通过实验研究相互作用对三维动力学安德森金属-绝缘体转变的影响。我们观察到相互作用驱动的亚扩散以及在接近相边界时离域起始时间的发散。平均场数值模拟与实验观测结果在定性上相符，但在定量上存在显著偏差。
