%0 Journal Article
%T The excitonic Zeeman effect in uniaxially-strained germanium
%A Gol'tsman, G. N.
%A Gusinskii, E. N.
%A Malyavkin, A. V.
%A Ptitsina, N. G.
%A Selevko, A. G.
%A Edel'shtein, V. M.
%J Sov. Phys. JETP
%D 1987
%V 65
%N 6
%F Goltsman_etal1987
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1705), last updated on Fri, 28 May 2021 19:14:25 -0500
%X We have carried out a high-resolution spectroscopic study of the absorption of submillimeter radiation by free excitons in germanium compressed along the [ 1 11 ] axis in a magnetic field parallel to the compression axis. In particular, we studied the splitting of the 1s- 2p transition in fields up to 6 kOe at T = 1.6 K, and observed a complex pattern in the Zeeman splitting which we believe is related to the effect of thermal motion of the excitons in a magnetic field on their internal structure (the magneto-Stark effect). The calculated submillimeter spectrum of excitons agrees with the experimental data. We predict that in a magnetic field the energy of the 2p, term is a minimum at a finite value of the exciton momentum perpendicular to the field-that is, the energy minimum forms a ring in momentum space. It follows that the density of states for this term must be a nonmonotonic function of the energy. A theory is developed of analogous phenomena in positronium.
%K Ge
%K Zeeman effect
%U http://www.jetp.ac.ru/cgi-bin/r/index/e/65/6/p1233?a=list
%P 1233-1241