Density waves at the interface of a binary complex plasma Li Yang, Mierk Schwabe, Sergey Zhdanov, Hubertus M. Thomas, Andrey M. Lipaev, Vladimir I. Molotkov, Vladimir E. Fortov, Jing Zhang and Cheng-Ran Du EPL, 117 2 (2017) 25001 Published online: 06 March 2017 DOI: 10.1209/0295-5075/117/25001