© North-Holland Publishing Company MAGNETOOSCILLAT1ONS OF THE ELECTRON—HOLE-DROP LUMINESCENCE IN GERMANIUM

Measurements of the magnetoluminescence from electron hole diops (EHD) were performed; intensity, halfwidth, and decay time of the EHD line show up oscillations as a function of the magnetic field in the region between 5 and 30 kOe. These oscillations can be explained by magnetoosciilations of the carrier density inside the EHD due to oscillatory parts in the free energy of the electron—hole plasma. At temperatures below 6 K and high enough excitation densities excitons in pure germanium condense into electron—hole drops (EHD) [1 3j.This condensed phase can be described as a quasimetallic plasma with a carrier density n0 which is defined by the minimum of the free energy of the electron hole system [4 61. According to Keldysh and Silin [7], in a magnetic field the free energy of the EHD should exhibit a field-dependent oscillatory part. This should give rise to oscillations of n0, as in contrast to metals this quantity is not fixed in the EHD by e.g. geometry conditions. Measurements of the EHD luminescence under the influence of a magne-tic field for the first time were carried out by Bagaev et al. [81,who attributed the magnetooscillations they found in the integrated intensity of the EHD luminescenc