@Article{Gershenzon_etal1976, author="Gershenzon, E. M. and Gol{\textquoteright}tsman, G. N. and Ptitsina, N. G.", title="Investigation of free excitons in Ge and their condensation at submillimeter wavelengths", journal="Sov. Phys. JETP", year="1976", volume="43", number="1", pages="116--122", optkeywords="Ge; free excitons", abstract="Results are presented of an investigation of free excitons in Ge in the submillimeter wavelength range for low as well as for high excitation levels when interaction between the excitons becomes important. The free-exciton energy spectrum is discussed. It is shown that the drop radii and their concentrations can be determined by measuring the temperature dependence of the free-exciton concentration. A section of the phase diagram is obtained in the 0.5-2.8 K temperature range for the free excitons+condensate system.", optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=1731), last updated on Sun, 30 May 2021 11:45:38 -0500", opturl="http://www.jetp.ac.ru/cgi-bin/e/index/e/43/1/p116?a=list" }