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A cascading nonlinear magneto-optical effect in topological insulators

Topological insulators (TIs) are characterized by possessing metallic (gapless) surface states and a finite band-gap state in the bulk. As the thickness of a TI layer decreases down to a few nanometers, hybridization between the top and bottom surfaces takes place due to quantum tunneling, consequen...

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Autores principales: Mondal, Richarj, Saito, Yuta, Aihara, Yuki, Fons, Paul, Kolobov, Alexander V., Tominaga, Junji, Murakami, Shuichi, Hase, Muneaki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5834634/
https://www.ncbi.nlm.nih.gov/pubmed/29500471
http://dx.doi.org/10.1038/s41598-018-22196-x
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author Mondal, Richarj
Saito, Yuta
Aihara, Yuki
Fons, Paul
Kolobov, Alexander V.
Tominaga, Junji
Murakami, Shuichi
Hase, Muneaki
author_facet Mondal, Richarj
Saito, Yuta
Aihara, Yuki
Fons, Paul
Kolobov, Alexander V.
Tominaga, Junji
Murakami, Shuichi
Hase, Muneaki
author_sort Mondal, Richarj
collection PubMed
description Topological insulators (TIs) are characterized by possessing metallic (gapless) surface states and a finite band-gap state in the bulk. As the thickness of a TI layer decreases down to a few nanometers, hybridization between the top and bottom surfaces takes place due to quantum tunneling, consequently at a critical thickness a crossover from a 3D-TI to a 2D insulator occurs. Although such a crossover is generally accessible by scanning tunneling microscopy, or by angle-resolved photoemission spectroscopy, such measurements require clean surfaces. Here, we demonstrate that a cascading nonlinear magneto-optical effect induced via strong spin-orbit coupling can examine such crossovers. The helicity dependence of the time-resolved Kerr rotation exhibits a robust change in periodicity at a critical thickness, from which it is possible to predict the formation of a Dirac cone in a film several quintuple layers thick. This method enables prediction of a Dirac cone using a fundamental nonlinear optical effect that can be applied to a wide range of TIs and related 2D materials.
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spelling pubmed-58346342018-03-05 A cascading nonlinear magneto-optical effect in topological insulators Mondal, Richarj Saito, Yuta Aihara, Yuki Fons, Paul Kolobov, Alexander V. Tominaga, Junji Murakami, Shuichi Hase, Muneaki Sci Rep Article Topological insulators (TIs) are characterized by possessing metallic (gapless) surface states and a finite band-gap state in the bulk. As the thickness of a TI layer decreases down to a few nanometers, hybridization between the top and bottom surfaces takes place due to quantum tunneling, consequently at a critical thickness a crossover from a 3D-TI to a 2D insulator occurs. Although such a crossover is generally accessible by scanning tunneling microscopy, or by angle-resolved photoemission spectroscopy, such measurements require clean surfaces. Here, we demonstrate that a cascading nonlinear magneto-optical effect induced via strong spin-orbit coupling can examine such crossovers. The helicity dependence of the time-resolved Kerr rotation exhibits a robust change in periodicity at a critical thickness, from which it is possible to predict the formation of a Dirac cone in a film several quintuple layers thick. This method enables prediction of a Dirac cone using a fundamental nonlinear optical effect that can be applied to a wide range of TIs and related 2D materials. Nature Publishing Group UK 2018-03-02 /pmc/articles/PMC5834634/ /pubmed/29500471 http://dx.doi.org/10.1038/s41598-018-22196-x Text en © The Author(s) 2018 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
Mondal, Richarj
Saito, Yuta
Aihara, Yuki
Fons, Paul
Kolobov, Alexander V.
Tominaga, Junji
Murakami, Shuichi
Hase, Muneaki
A cascading nonlinear magneto-optical effect in topological insulators
title A cascading nonlinear magneto-optical effect in topological insulators
title_full A cascading nonlinear magneto-optical effect in topological insulators
title_fullStr A cascading nonlinear magneto-optical effect in topological insulators
title_full_unstemmed A cascading nonlinear magneto-optical effect in topological insulators
title_short A cascading nonlinear magneto-optical effect in topological insulators
title_sort cascading nonlinear magneto-optical effect in topological insulators
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5834634/
https://www.ncbi.nlm.nih.gov/pubmed/29500471
http://dx.doi.org/10.1038/s41598-018-22196-x
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