Wannier-Stark states in a superlattice of InAs/GaAs quantum dots View Full Text


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Article Info

DATE

2010-06-27

AUTHORS

M. M. Sobolev, A. P. Vasil’ev, V. N. Nevedomskii

ABSTRACT

Electron and hole emission from states of a ten-layer system of tunneling-coupled vertically correlated InAs/GaAs quantum dots (QDs) is studied experimentally by capacitance—voltage measurements and deep-level transient spectroscopy. The thickness of GaAs interlayers separating sheets of InAs QDs was ≈3 nm, as determined from transmission electron microscope images. It is found that the periodic multimo-dal DLTS spectrum of this structure exhibits a pronounced linear shift as the reverse-bias voltage Ur applied to the structure is varied. The observed behavior is a manifestation of the Wannier—Stark effect in the InAs/GaAs superlattice, where the presence of an external electric field leads to the suppression of coupling between the wave functions of electron states forming the miniband and to the appearance of a series of discrete levels called Wannier—Stark ladder states. More... »

PAGES

761-765

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063782610060126

DOI

http://dx.doi.org/10.1134/s1063782610060126

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1026732445


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