Gruss Daniel, Chien Chih-Chun, Barreiro Julio T, Di Ventra Massimiliano, Zwolak Michael
Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Maryland NanoCenter, University of Maryland, College Park, MD 20742.
New J Phys. 2018;20. doi: 10.1088/1367-2630/aaedcf.
We propose a method to probe the local density of states (LDOS) of atomic systems that provides both spatial and energy resolution. The method combines atomic and tunneling techniques to supply a simple, yet quantitative and operational, definition of the LDOS for both interacting and non-interacting systems: It is the rate at which particles can be siphoned from the system of interest by a narrow energy band of non-interacting states contacted locally to the many-body system of interest. Ultracold atoms in optical lattices are a natural platform for implementing this broad concept to visualize the energy and spatial dependence of the atom density in interacting, inhomogeneous lattices. This includes models of strongly correlated condensed matter systems, as well as ones with non-trivial topologies.
我们提出了一种探测原子系统局域态密度（LDOS）的方法，该方法兼具空间分辨率和能量分辨率。此方法结合了原子技术和隧穿技术，为相互作用和非相互作用系统提供了一个简单、定量且可操作的LDOS定义：它是通过与感兴趣的多体系统局部接触的非相互作用态的窄能带，从感兴趣的系统中抽取粒子的速率。光学晶格中的超冷原子是实现这一广泛概念的天然平台，可用于可视化相互作用的非均匀晶格中原子密度的能量和空间依赖性。这包括强关联凝聚态物质系统的模型，以及具有非平凡拓扑结构的模型。
