Hubbard exciton fluids in Mott antiferromagnets

Antiferromagnetic correlations in Mott insulators are predicted to enhance the attractive interactions between holons and doublons, leading to the formation of a bound state known as a Hubbard exciton. However, experimental evidence for Hubbard excitons and their magnetic binding mechanism remain sparse. In this talk, I will discuss recent ultrafast time-resolved time-domain THz spectroscopy measurements directed at searching for signatures of intra-excitonic transitions in Mott antiferromagnets. These measurements reveal the ultrafast formation of a transient Hubbard excitonic fluid in several Mott insulating compounds. The effects of magnetic ordering on these fluids will be discussed.