Giant photogalvanopiezomagnetic effect in germanium under excitonmetallization conditions
Kukushkin I. V. , Kulakovskii V. D. , Timofeev V. B.
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).
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![](/ps/1325/article_20021_800_head.png "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 <b><i>e~h </i></b>plasma with a density 7X10<sup>15</sup> cm"<sup>3 </sup><b><i>(r<sub>s</sub> </i></b>~2).")