Observation of the Topological Anderson Insulator in Disordered Synthetic Lattices

Dr Bryce Gadway (hosted by Kater Murch), Department of Physics, University of Illinois Urbana-Champaign
April 23, 2018 at 4:00 pm
241 Compton
Event Description 

Disorder and topology have many deep connections, and can have a rich combined influence on the transport properties of quantum particles. Some of the most useful and intriguing properties of topological systems, like the integer quantum Hall gases of two-dimensional electrons, relate to the robustness of their edge states with respect to weak disorder. Rich physics is expected to occur as strong disorder is added to such systems, resulting in the global unwinding of the non-local, topological order. Surprisingly, it has even been predicted that disorder can induce topological properties in normal materials. Despite these deep and rich connections, the difficulty of creating controlled disorder in real materials has prevented the exploration of disorder-driven changes in topology in any experimental system. Here we describe how an experiment based on extremely dilute atomic gases at ultracold [nanoKelvin-scale] temperatures can mimic the physics of disordered topological materials. We describe the observation of disorder-induced topology in one-dimensional atomic wires, relating to the topological Anderson insulator phase predicted nearly a decade ago. We also discuss prospects for the realization of strongly interacting topological matter based on atomic interactions in this system.

 

Coffee:  3:45 pm, 241 Compton