Universal magnetoluminescence kinetics in magnetically frozen 2D electron systems

The kinetics of recombination of electrons and acceptor-bound holes in AlGaAs-GaAs heterostructure obey a single-exponential decay in the liquid phase of 2D electrons, whereas localization gives rise to a broad spectrum of recombination rates, especially in the magnetic freeze-out regime, This results in a power-law dependence I(t)(proportional to)(tau/t)(alpha) in the tail of the recombination kinetics, with the universal exponent alpha=(1 - nu)(-1) at nu<1 for all the samples examined experimentally in this work. (C) 1996 American Institute of Physics

Evidence of the triangular lattice of crystallized electrons from time resolved luminescence

We show that the recombination kinetics of two-dimensional electrons with acceptor bound holes is a sensitive probe of the local spatial structure of the electronic system. Using the time resolved magnetoluminescence, we extract the regime of the electron Wigner solid and establish its local configuration consistent with the triangular lattice model. Up to the melting point, the amplitude of the thermal vibrations of the electron crystal is derived from the temperature dependence of the recombination kinetics