Microscopic thickness variation of macroscopically uniform quantum wells
Recently, GaAs/AlxGa1−xAs quantum wells were grown, which display remarkable uniformity, over macroscopic distances, in the splitting of their photoluminescence lines. The negligible variation of the peak splitting was interpreted as being consistent with a number of possible interface configuration...
Published in: | Applied Physics Letters |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AIP Publishing
1992
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1063/1.107464 https://pubs.aip.org/aip/apl/article-pdf/60/3/386/18486914/386_1_online.pdf |
id |
craippubl:10.1063/1.107464 |
---|---|
record_format |
openpolar |
spelling |
craippubl:10.1063/1.107464 2024-06-16T07:43:09+00:00 Microscopic thickness variation of macroscopically uniform quantum wells Warwick, Colin A. Kopf, Rose F. 1992 http://dx.doi.org/10.1063/1.107464 https://pubs.aip.org/aip/apl/article-pdf/60/3/386/18486914/386_1_online.pdf en eng AIP Publishing Applied Physics Letters volume 60, issue 3, page 386-388 ISSN 0003-6951 1077-3118 journal-article 1992 craippubl https://doi.org/10.1063/1.107464 2024-05-17T12:55:13Z Recently, GaAs/AlxGa1−xAs quantum wells were grown, which display remarkable uniformity, over macroscopic distances, in the splitting of their photoluminescence lines. The negligible variation of the peak splitting was interpreted as being consistent with a number of possible interface configurations, the simplest of which was abrupt, atomically smooth interfaces with discrete thickness changes of integer multiples of monolayers. However, here, further analysis of the splittings show them to be slightly below one monolayer, supporting a modification of the ‘‘atomically smooth island’’ picture to one of microroughness, defined as that having a length scale below the exciton diameter (≊15 nm), superimposed on islands larger than the exciton diameter. In addition, by extending these measurements to the ‘‘mesoscopic’’ regime by a high resolution cathodoluminescence technique, we directly show that these microrough islands can have sizes smaller than the spatial resolution of our scanning cathodoluminescence microscope, ≊60 nm. Article in Journal/Newspaper Smooth Island AIP Publishing Smooth Island ENVELOPE(-64.265,-64.265,-65.228,-65.228) Applied Physics Letters 60 3 386 388 |
institution |
Open Polar |
collection |
AIP Publishing |
op_collection_id |
craippubl |
language |
English |
description |
Recently, GaAs/AlxGa1−xAs quantum wells were grown, which display remarkable uniformity, over macroscopic distances, in the splitting of their photoluminescence lines. The negligible variation of the peak splitting was interpreted as being consistent with a number of possible interface configurations, the simplest of which was abrupt, atomically smooth interfaces with discrete thickness changes of integer multiples of monolayers. However, here, further analysis of the splittings show them to be slightly below one monolayer, supporting a modification of the ‘‘atomically smooth island’’ picture to one of microroughness, defined as that having a length scale below the exciton diameter (≊15 nm), superimposed on islands larger than the exciton diameter. In addition, by extending these measurements to the ‘‘mesoscopic’’ regime by a high resolution cathodoluminescence technique, we directly show that these microrough islands can have sizes smaller than the spatial resolution of our scanning cathodoluminescence microscope, ≊60 nm. |
format |
Article in Journal/Newspaper |
author |
Warwick, Colin A. Kopf, Rose F. |
spellingShingle |
Warwick, Colin A. Kopf, Rose F. Microscopic thickness variation of macroscopically uniform quantum wells |
author_facet |
Warwick, Colin A. Kopf, Rose F. |
author_sort |
Warwick, Colin A. |
title |
Microscopic thickness variation of macroscopically uniform quantum wells |
title_short |
Microscopic thickness variation of macroscopically uniform quantum wells |
title_full |
Microscopic thickness variation of macroscopically uniform quantum wells |
title_fullStr |
Microscopic thickness variation of macroscopically uniform quantum wells |
title_full_unstemmed |
Microscopic thickness variation of macroscopically uniform quantum wells |
title_sort |
microscopic thickness variation of macroscopically uniform quantum wells |
publisher |
AIP Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1063/1.107464 https://pubs.aip.org/aip/apl/article-pdf/60/3/386/18486914/386_1_online.pdf |
long_lat |
ENVELOPE(-64.265,-64.265,-65.228,-65.228) |
geographic |
Smooth Island |
geographic_facet |
Smooth Island |
genre |
Smooth Island |
genre_facet |
Smooth Island |
op_source |
Applied Physics Letters volume 60, issue 3, page 386-388 ISSN 0003-6951 1077-3118 |
op_doi |
https://doi.org/10.1063/1.107464 |
container_title |
Applied Physics Letters |
container_volume |
60 |
container_issue |
3 |
container_start_page |
386 |
op_container_end_page |
388 |
_version_ |
1802010938074726400 |