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VOLUME 35 | ISSUE 9 | PAGE 367
Giant photogalvanopiezomagnetic effect in germanium under excitonmetallization conditions
A sharp jump in the photocurrent has been observed at high excitation densities in germanium crystals in a magnetic field crossed with an inhomogeneous strain field at 2 K. The jump in the photocurrent results from an insulator-metal transition in a dense system of drifting excitons. The transition is accompanied by the appearance, above a threshold, of a new spectral line, which corresponds to the recombination emission of an e~h plasma with a density 7X1015 cm"3 (rs ~2).