Probing electron quadrupling order through ultrasound

C Halcrow, I Shipulin, F Caglieris, Y Li… - arxiv preprint arxiv …, 2024 - arxiv.org
Recent experiments have pointed to the formation of a new state of matter, the electron
quadrupling condensate in Ba $ _ {1-x} $ K $ _x $ Fe $ _2 $ As $ _2 $. The state …

Topological order in higher composites

E Babaev - Physical Review Research, 2024 - APS
We introduce the concept of composite topological order in multicomponent systems. In such
a state topological order appears only in higher-than-usual composites, with no topological …