Temperature-modulated superradiance near phase transition material

We study the interaction between two quantum emitters connected through vanadium dioxide (VO2) which exhibits a first-order metal–insulator transition (MIT). The experimental data describing the dielectric function of VO2 in this study are collected from previously published works. The radiative states denoted as decay factor of two quantum emitters in the reflection and transmission configurations are investigated in detail. We find that the interconversion of the superradiant and subradiant states can easily be achieved in both configurations by controlling the temperature of VO2. The transition of decay factors from insulator to metal (heating process) and metal to insulator (cooling process) follows different paths. These factors exhibit hysteresis phenomenon and form a hysteresis loop. We also find that the decay factor in either the heating or cooling process increases sharply and reaches a maximum value at the phase transition temperature. The temperature-modulated superradiance obtained in this work offers a new efficient method to control the interaction between quantum emitters.