arXiv (Cornell University)
Dynamical crossover between stretched- and compressed-exponential relaxation in a photoexcited crystal
September 2025 • Tyler Carbin, J Herman, Xinshu Zhang, Adrian B. Culver, Shengdong Zhang, Hengdi Zhao, Rahul Roy, Gang Cao, Anshul Kogar
Anomalous relaxation is one of the hallmarks of disordered systems. Following perturbation by an external source, many glassy, jammed and amorphous systems relax as a stretched or compressed exponential as a function of time. However, despite their ubiquity, the origins of and the connection between these phenomenological relaxation functions remains to be understood. Here, we observe a tunable crossover from stretched- to compressed-exponential relaxation by photoexciting single crystal Ca3Ru2O7 across a structur…