Miniband Formation at Finite Electric Fields in a Graded-Gap Superlattice
A graded-gap superlattice of Al sub x Ga sub 1 sub - sub x As-Alsub y Ga sub 1 sub -sub y As is studied with differential photocurrent spectroscopy at 77 K. With increasing electric field, the lowest conduction subband exhibits a transition from localized to extended miniband states and back to loca...
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Veröffentlicht in: | Europhysics letters 1993-08, Vol.23 (4), p.283-288 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A graded-gap superlattice of Al sub x Ga sub 1 sub - sub x As-Alsub y Ga sub 1 sub -sub y As is studied with differential photocurrent spectroscopy at 77 K. With increasing electric field, the lowest conduction subband exhibits a transition from localized to extended miniband states and back to localized states. Calculations of miniband width using different methods support the interpretation of miniband formation at finite electric fields. |
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ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/0295-5075/23/4/008 |