Auger recombination dynamics of lead salts under picosecond free-electron-laser excitation

P. C. Findlay, C. R. Pidgeon, R. Kotitschke, A. Hollingworth, B. N. Murdin, C. J G M Langerak, A. F G Van Der Meer, C. M. Ciesla, J. Oswald, A. Homer, G. Springholz, G. Bauer

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Pump-probe transmission experiments have been performed on PbSe above the fundamental absorption edge near 4 µm in the temperature range 30 to 300 K, using the Dutch ps free-electron laser. For temperatures below 200 K and carrier densities above the threshold for stimulated emission, stimulated recombination represents the most efficient recombination mechanism with relatively fast kinetics in the 50-100-ps regime, in good agreement with earlier reports of photoluminescent emission. Above this temperature Auger recombination dominates, and the Auger coefficient C is determined from the pump-probe decay curves. In the low-temperature regime the Auger coefficient is determined from the decay curves at times beyond 100 ps. The Auger coefficient is approximately constant (with a value of about 8 × 10-28 cm6 s-1) between 300 and 70 K, and then drops a value of about 1 × 10-28 cm6 s-1 at 30 K, in good agreement with the theory for nonparabolic near-mirror bands and nondegenerate statistics. It is found that C for PbSe is between one and two orders of magnitude lower than for Hg1-xCdxTe of comparable band gap. © 1998 The American Physical Society.

Original languageEnglish
Pages (from-to)12908-12915
Number of pages8
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - 1998


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