Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)

We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in a mesoscopic topological insulator PbBi(4)Te(7) device. From SdH oscillations, the evidence of Dirac fermions with π Berry phase is found and the experimentally determined two main Fermi wav...

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Autores principales: Mal, Priyanath, Das, Bipul, Lakhani, Archana, Bera, Ganesh, Turpu, G. R., Wu, Jong-Ching, Tomy, C. V., Das, Pradip
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6505531/
https://www.ncbi.nlm.nih.gov/pubmed/31065054
http://dx.doi.org/10.1038/s41598-019-43534-7
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author Mal, Priyanath
Das, Bipul
Lakhani, Archana
Bera, Ganesh
Turpu, G. R.
Wu, Jong-Ching
Tomy, C. V.
Das, Pradip
author_facet Mal, Priyanath
Das, Bipul
Lakhani, Archana
Bera, Ganesh
Turpu, G. R.
Wu, Jong-Ching
Tomy, C. V.
Das, Pradip
author_sort Mal, Priyanath
collection PubMed
description We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in a mesoscopic topological insulator PbBi(4)Te(7) device. From SdH oscillations, the evidence of Dirac fermions with π Berry phase is found and the experimentally determined two main Fermi wave vectors are correlated to two surface Dirac cones (buried one inside the other) of layered topological insulator PbBi(4)Te(7). We have also found evidence of conductance fluctuations, the root mean square amplitude of which is much higher than the usual universal conductance fluctuations observed in nanometer size sample. Calculated autocorrelation functions indicate periodic unique fluctuations may be associated with the topological surface states in the compound.
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spelling pubmed-65055312019-05-21 Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7) Mal, Priyanath Das, Bipul Lakhani, Archana Bera, Ganesh Turpu, G. R. Wu, Jong-Ching Tomy, C. V. Das, Pradip Sci Rep Article We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in a mesoscopic topological insulator PbBi(4)Te(7) device. From SdH oscillations, the evidence of Dirac fermions with π Berry phase is found and the experimentally determined two main Fermi wave vectors are correlated to two surface Dirac cones (buried one inside the other) of layered topological insulator PbBi(4)Te(7). We have also found evidence of conductance fluctuations, the root mean square amplitude of which is much higher than the usual universal conductance fluctuations observed in nanometer size sample. Calculated autocorrelation functions indicate periodic unique fluctuations may be associated with the topological surface states in the compound. Nature Publishing Group UK 2019-05-07 /pmc/articles/PMC6505531/ /pubmed/31065054 http://dx.doi.org/10.1038/s41598-019-43534-7 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Mal, Priyanath
Das, Bipul
Lakhani, Archana
Bera, Ganesh
Turpu, G. R.
Wu, Jong-Ching
Tomy, C. V.
Das, Pradip
Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title_full Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title_fullStr Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title_full_unstemmed Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title_short Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi(4)Te(7)
title_sort unusual conductance fluctuations and quantum oscillation in mesoscopic topological insulator pbbi(4)te(7)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6505531/
https://www.ncbi.nlm.nih.gov/pubmed/31065054
http://dx.doi.org/10.1038/s41598-019-43534-7
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