Bose gas of spin-oriented excitons in uniaxially deformed germanium
Kukushkin I. V., Kulakovskii V. D., Timofeev V. B.
A narrowing of the spontaneous, indirect exciton-annihilation line with increasing density of Optical excitation has been detected in uniaxially compressed Ge crystals in a magnetic field that orients the spin of the electrons and holes in the excitons. The observed changes in the exciton-phonon radiation spectrum of the high-density exciton gas are explained in terms of the nonideal Bose gas.