Time-resolved electronic capture in n-type germanium doped with antimony
Time-resolved electronic capture in n-type germanium doped with antimony
Deßmann, N.; Pavlov, S. G.; Shastin, V. N.; Zhukavin, R. K.; Tsyplenkov, V. V.; Winnerl, S.; Mittendorff, M.; Abrosimov, N. V.; Riemann, H.; Hübers, H.-W.
Abstract
The low temperature (T = 5–40 K) capture of free electrons into hydrogenlike antimony centers in germanium has been studied by a time-resolving experiment using the free electron laser FELBE. The analysis of the pump-probe signal reveals a typical capture time of about 1.7 ns that decreases with pump energy to less than 1 ns while the number of ionized donors increases. The dependence on the pump-pulse energy is well described by an acoustic phonon-assisted capture process. In the cases when (i) a significant number of the electrons is in the conduction band (flux densities larger than 5 × 10^25 photons/(cm^2 s), (ii) the lattice temperature is above ∼20 K, or (iii) a static electric field above ∼2 V/cm is applied to the crystal, the pump-probe technique reveals an additional intraband relaxation process with a characteristic time of ∼100 ps, which is much shorter than that of the capture of free electrons into the antimony ground state.
Beteiligte Forschungsanlagen
- Strahlungsquelle ELBE DOI: 10.17815/jlsrf-2-58
Verknüpfte Publikationen
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 20040) publication
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Physical Review B 89(2014), 035205
DOI: 10.1103/PhysRevB.89.035205
Cited 19 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-20040