Oscillatory screening of the dc electric field in the Si-SiO$_2$ multiple quantum wells probed by second-harmonic generation

Details Oscillatory screening of the dc electric field in the Si-SiO$_2$ multiple quantum wells probed by second-harmonic generation Oscillatory screening of the dc electric field in the Si-SiO$_2$ multiple quantum wells probed by second-harmonic generation

1999-08-17

arxiv.org/abs/cond-mat/9908238v1

Physics

Condensed Matter

submitted to PRL

Scientific paper

DC-electric field, being screened in 3D semiconductors, normally decays monotonically in space. Experimental studies of the DC electric field screening in Si-SiO$_2$ multiple quantum wells by electric field induced optical second-harmonic generation show a non-monotonic, oscillatory-like decay. The model of electrons localized inside quantum wells, with the first subband occupied, allows a description of the phenomenon. Interwell Coulomb interaction, a finite value of the electron charge and strong effective-mass anisotropy result in a crucial difference from 3D Fermi liquid.

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