Excitonic quasiparticles in a spin-orbit Mott insulator

Many of the fundamental effects in condensed matter physics can be described in the framework of quasiparticles. Here, the authors observe quasiparticles related to the antiferromagnetic state in quasi-two-dimensional Sr2IrO4, showing close resemblances to elusive quasiparticles in cuprate superconductors.