Giant Rydberg excitons in Cu2O probed by photoluminescence excitation spectroscopy

Marijn A. M. Versteegh; Stephan Steinhauer; Josip Bajo; Thomas Lettner; Ariadna Soro Álvarez; Alena Romanova; Samuel Gyger; Lucas Schweickert; Andre Mysyrowicz; Val Zwiller

doi:10.1103/PhysRevB.104.245206

Giant Rydberg excitons in Cu2O probed by photoluminescence excitation spectroscopy
Journal article, 2021

Rydberg excitons are, with their ultrastrong mutual interactions, giant optical nonlinearities, and very high sensitivity to external fields, promising for applications in quantum sensing and nonlinear optics at the singlephoton level. To design quantum applications it is necessary to know how Rydberg excitons and other excited states relax to lower-lying exciton states. Here, we present photoluminescence excitation spectroscopy as a method to probe transition probabilities from various excitonic states in cuprous oxide. We show giant Rydberg excitons at T = 38 mK with principal quantum numbers up to n = 30, corresponding to a calculated diameter of 3 mu m.