  Control over spontaneous emission rate is important for improving efficiency
in different semiconductor applications including lasers, LEDs and
photovoltaics. Usually, an emitter should be placed inside the cavity to
increase spontaneous emission rate, although it is technologically challenging.
Here we experimentally demonstrate a phenomenon of super-radiance observed in a
cavity-less periodic Bragg structure based on InAs monolayer-thick multiple
quantum wells (MQW). The collective super-radiant mode shows enhanced emission
rate for specific angles and frequencies. This behaviour correlates with the
calculations demonstrating individual spots of enhanced Purcell coefficient
near the Bragg condition curve. This study provides a perspective for
realization of surface emitting cavity-less lasers with distributed feedback.
