We report the first experimental evidence that spatial correlations inhibit localization of states in disordered low-dimensional systems, as previous theoretical calculations suggested in contrast to the earlier belief that all eigenstates are localized. This has been done studying the dc vertical transport and photoluminescence (PL) in GaAs-AlGaAs superlattices (SL’s) with intentional correlated disorder. The spectra are compared to those obtained in ordered and uncorrelated disordered superlattices. To verify this theoretical prevision we grew several n-i-n heterostructures (being i the undoped SL”s) by molecular beam epitaxy.
Extended states in Correlated Disordered GaAs/AlGaAs Superlattices
BELLANI, VITTORIO;PARRAVICINI, GIANBATTISTA;
1999-01-01
Abstract
We report the first experimental evidence that spatial correlations inhibit localization of states in disordered low-dimensional systems, as previous theoretical calculations suggested in contrast to the earlier belief that all eigenstates are localized. This has been done studying the dc vertical transport and photoluminescence (PL) in GaAs-AlGaAs superlattices (SL’s) with intentional correlated disorder. The spectra are compared to those obtained in ordered and uncorrelated disordered superlattices. To verify this theoretical prevision we grew several n-i-n heterostructures (being i the undoped SL”s) by molecular beam epitaxy.File in questo prodotto:
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