Coherent quantum transport features in carbon superlattice structures

Whilst resonant transmission is well understood and can be fully harnessed for crystalline superlattices, a complete picture has not yet emerged for disordered superlattices. It has proven difficult to tune resonant transmission in disordered diamond-like carbon (DLC) superlattices as conventional m...

Full description

Bibliographic Details
Main Authors:	McIntosh, R., Henley, S. J., Silva, S. R. P., Bhattacharyya, S.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069478/

id	pubmed-5069478
recordtype	oai_dc
spelling	pubmed-50694782016-10-26 Coherent quantum transport features in carbon superlattice structures McIntosh, R. Henley, S. J. Silva, S. R. P. Bhattacharyya, S. Article Whilst resonant transmission is well understood and can be fully harnessed for crystalline superlattices, a complete picture has not yet emerged for disordered superlattices. It has proven difficult to tune resonant transmission in disordered diamond-like carbon (DLC) superlattices as conventional models are not equipped to incorporate significant structural disorder. In this work, we present concurrent experimental and theoretical analysis which addresses resonant transmission in DLC superlattices. Devices were fabricated by growing alternate layers of DLC with different percentages of sp3 hybridized carbon.Coherent quantum transport effects were demonstrated in these structurally disordered DLC superlattices through distinct current modulation with negative differential resistance (NDR) in the current-voltage (I-V) measurements. A model was developed using tight-binding calculations assuming a random variation of the hopping integral to simulate structural (bond-length) disorder. Calculations of the I-V characteristics compliment the interpretation of the measurements and illustrate that while DLC superlattice structures are unlike their classical counterparts, the near-field structural order will help with the confinement of quantised states. The present model provides an empirical guide for tailoring the properties of future devices, giving rise to much hope that carbon electronics operating at high frequencies over large areas can now be developed. Nature Publishing Group 2016-10-19 /pmc/articles/PMC5069478/ /pubmed/27759047 http://dx.doi.org/10.1038/srep35526 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	McIntosh, R. Henley, S. J. Silva, S. R. P. Bhattacharyya, S.
spellingShingle	McIntosh, R. Henley, S. J. Silva, S. R. P. Bhattacharyya, S. Coherent quantum transport features in carbon superlattice structures
author_facet	McIntosh, R. Henley, S. J. Silva, S. R. P. Bhattacharyya, S.
author_sort	McIntosh, R.
title	Coherent quantum transport features in carbon superlattice structures
title_short	Coherent quantum transport features in carbon superlattice structures
title_full	Coherent quantum transport features in carbon superlattice structures
title_fullStr	Coherent quantum transport features in carbon superlattice structures
title_full_unstemmed	Coherent quantum transport features in carbon superlattice structures
title_sort	coherent quantum transport features in carbon superlattice structures
description	Whilst resonant transmission is well understood and can be fully harnessed for crystalline superlattices, a complete picture has not yet emerged for disordered superlattices. It has proven difficult to tune resonant transmission in disordered diamond-like carbon (DLC) superlattices as conventional models are not equipped to incorporate significant structural disorder. In this work, we present concurrent experimental and theoretical analysis which addresses resonant transmission in DLC superlattices. Devices were fabricated by growing alternate layers of DLC with different percentages of sp3 hybridized carbon.Coherent quantum transport effects were demonstrated in these structurally disordered DLC superlattices through distinct current modulation with negative differential resistance (NDR) in the current-voltage (I-V) measurements. A model was developed using tight-binding calculations assuming a random variation of the hopping integral to simulate structural (bond-length) disorder. Calculations of the I-V characteristics compliment the interpretation of the measurements and illustrate that while DLC superlattice structures are unlike their classical counterparts, the near-field structural order will help with the confinement of quantised states. The present model provides an empirical guide for tailoring the properties of future devices, giving rise to much hope that carbon electronics operating at high frequencies over large areas can now be developed.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069478/
_version_	1613688620147802112

Coherent quantum transport features in carbon superlattice structures

Similar Items