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OBSERVATION OF MANY-BODY EFFECTS AND BAND-GAP RENORMALIZATION IN LOW-DIMENSIONAL SYSTEMS WITH BUILT-IN PIEZOELECTRIC FIELDS

MOORE, KJ; BORING, P; GIL, B; WOODBRIDGE, K; (1993) OBSERVATION OF MANY-BODY EFFECTS AND BAND-GAP RENORMALIZATION IN LOW-DIMENSIONAL SYSTEMS WITH BUILT-IN PIEZOELECTRIC FIELDS. PHYS REV B , 48 (24) 18010 - 18015.

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Abstract

We Show that many-body effects and band-gap renormalization can be easily produced in strained-layer quantum wells with internal built-in piezoelectric fields, under photoexcitation. Our observation was made at low temperature by comparing the behavior of Ga0.92In0.08As-GaAs strained-layer quantum wells grown along the (111) and (001) directions and tuning the densities of photoinjected carriers over several decades. Comparison between experimental data and the results of Hartree-calculations including the charge space effects-reveals that many-body interactions are photoinduced.

Type: Article
Title: OBSERVATION OF MANY-BODY EFFECTS AND BAND-GAP RENORMALIZATION IN LOW-DIMENSIONAL SYSTEMS WITH BUILT-IN PIEZOELECTRIC FIELDS
Keywords: QUANTUM-WELL STRUCTURES, STRAINED-LAYER SUPERLATTICES, 2-DIMENSIONAL ELECTRON-GAS, OPTICAL NONLINEARITIES, EDGE SINGULARITY, BLUE SHIFT, LUMINESCENCE SPECTRA, FREE-CARRIERS, HOLE PLASMA, DENSITY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/64800
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