Photon-number squeezing in a light-emitting diode driven by a constant-voltage source: Pump regulation by the non-coulombic effect

Experimental results on squeezing of photon-number fluctuations of a p-n ju nction light-emitting diode (LED) driven by a constant-voltage source are d emonstrated together with physical mechanisms responsible for the squeezing . The observed squeezing at room temperature is discovered to be explained not by the conventional collective Coulomb blockade model but by our new mo del which includes the effect of the microscopic nonlinear backward-pump pr ocess, which can work even in the constant-voltage operation.