Anomalous fluctuations of 2D-electron recombination radiation intensity inthe quantum Hall regime

Anomalous intensity fluctuations are observed in the spectrum of radiative recombination of quasi-two-dimensional (2D) electrons with photoexcited hol es in a single quantum well. The fluctuations are observed exclusively unde r the conditions of the quantum Hall effect (QHE). It is shown that, if the QHE conditions are not fulfilled, the radiation intensity fluctuates stric tly following the Poisson distribution (<delta N-2> / < N > = 1), whereas i n the QHE regime the fluctuation amplitude increases by several orders of m agnitude (<delta N-2> / < N > similar to 10(2)). It is demonstrated that th e maxima of the emission noise amplitude coincide with the maxima of invers e magnetoresistance of 2D electrons in the QHE regime and correspond to est ablishing an anomalously high uniformity of the system. (C) 2000 MAIK "Nauk a/Interperiodica".