Abstract
In experiments on excitons and spin-polarized atomic hydrogen, one deals with a gas involving two Bose branches (for example, paraexcitons and orthoexcitons). Based on a simple model for the coupling between these two components, we discuss how interconversion processes affect Bose condensation in such a system. Our analysis is based on an exact transformation to renormalized Bose particles which are uncoupled. We give results for the condensate fraction as a function of the temperature in the case when the two original Bose particles ([ital a] and [ital b]) are not in chemical equilibrium (i.e., the chemical potentials [mu][sub [ital a]] and [mu][sub [ital b]] are not equal) as well as in the case of chemical equilibrium ([mu][sub [ital a]]=[mu][sub [ital b]]). Our results are of interest in connection with current attempts to observe Bose condensation in atomiclike gases.
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