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

P. C. Findlay | Zendy; C. R. Pidgeon | Zendy; R. T. Kotitschke | Zendy; A. R. Hollingworth | Zendy; B. N. Murdin | Zendy; C. J. G. M. Langerak | Zendy; A. F. G. van der Meer | Zendy; C. M. Ciesla | Zendy; J. Oswald | Zendy; A. Homer | Zendy; G. Springholz | Zendy; G. Bauer | Zendy

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

Author(s) -

P. C. Findlay,

C. R. Pidgeon,

R. T. Kotitschke,

A. R. 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

Publication year - 1998

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.58.12908

Subject(s) - atomic physics , physics , auger effect , auger , picosecond , excitation , electron , recombination , laser , nuclear physics , optics , chemistry , biochemistry , quantum mechanics , gene

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 Hg_1-xCd_xTe of comparable band gap.