Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1996-10-14
Phys. Rev B 54, No. 23 (15 December 1996)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, LaTeX2.09, 8 PostScript figures
Scientific paper
10.1103/PhysRevB.54.17730
Electron capture times due to the electron-electron (e-e), electron-hole (e-h) and electron-polar optical phonon (e-pop) interactions are calculated in the GaAs quantum well (QW) with electron and hole densities 10^11 cm^-2. The calculated capture times oscillate as a function of the QW width with the same period but with different amplitudes. The e-h capture time is two to four orders larger and the e-e capture time one to three orders larger than the e-pop capture time. The exceptions are the QW widths near resonance minima, where the e-e capture time is only 2-3 times larger and the e-h capture time 10-100 times larger. Different physical origin of the oscillatory behavior is demonstrated for the e-e and e-pop capture times. Effects of exchange and degeneracy on the e-e capture are analysed. The exchange effect increases the e-e capture time approximately two times while the degeneracy does not change the capture time except for the QW depths and widths near the resonance.
Kalna Karol
Mosko Martin
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