Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3

Abstract We report semiconductor to metal-like crossover in the temperature dependence of resistivity (ρ) due to the switching of charge transport from bulk to surface channel in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3. Unlike earlier studies, a much sharper drop in ρ(T) is obse...

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Autores principales:	Prithwish Dutta, Arnab Pariari, Prabhat Mandal
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4a1aa7f3fb5c4a2f8c7b6ac63c027183
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spelling	oai:doaj.org-article:4a1aa7f3fb5c4a2f8c7b6ac63c0271832021-12-02T12:32:45ZProminent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.310.1038/s41598-017-05164-92045-2322https://doaj.org/article/4a1aa7f3fb5c4a2f8c7b6ac63c0271832017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05164-9https://doaj.org/toc/2045-2322Abstract We report semiconductor to metal-like crossover in the temperature dependence of resistivity (ρ) due to the switching of charge transport from bulk to surface channel in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3. Unlike earlier studies, a much sharper drop in ρ(T) is observed below the crossover temperature due to the dominant surface conduction. Remarkably, the resistivity of the conducting surface channel follows a rarely observable T 2 dependence at low temperature, as predicted theoretically for a two-dimensional Fermi liquid system. The field dependence of magnetization shows a cusp-like paramagnetic peak in the susceptibility (χ) at zero field over the diamagnetic background. The peak is found to be robust against temperature and χ decays linearly with the field from its zero-field value. This unique behavior of the χ is associated with the spin-momentum locked topological surface state in Bi1.5Sb0.5Te1.7Se1.3. The reconstruction of the surface state with time is clearly reflected through the reduction of the peak height with the age of the sample.Prithwish DuttaArnab PariariPrabhat MandalNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Prithwish Dutta Arnab Pariari Prabhat Mandal Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
description	Abstract We report semiconductor to metal-like crossover in the temperature dependence of resistivity (ρ) due to the switching of charge transport from bulk to surface channel in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3. Unlike earlier studies, a much sharper drop in ρ(T) is observed below the crossover temperature due to the dominant surface conduction. Remarkably, the resistivity of the conducting surface channel follows a rarely observable T 2 dependence at low temperature, as predicted theoretically for a two-dimensional Fermi liquid system. The field dependence of magnetization shows a cusp-like paramagnetic peak in the susceptibility (χ) at zero field over the diamagnetic background. The peak is found to be robust against temperature and χ decays linearly with the field from its zero-field value. This unique behavior of the χ is associated with the spin-momentum locked topological surface state in Bi1.5Sb0.5Te1.7Se1.3. The reconstruction of the surface state with time is clearly reflected through the reduction of the peak height with the age of the sample.
format	article
author	Prithwish Dutta Arnab Pariari Prabhat Mandal
author_facet	Prithwish Dutta Arnab Pariari Prabhat Mandal
author_sort	Prithwish Dutta
title	Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
title_short	Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
title_full	Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
title_fullStr	Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
title_full_unstemmed	Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3
title_sort	prominent metallic surface conduction and the singular magnetic response of topological dirac fermion in three-dimensional topological insulator bi1.5sb0.5te1.7se1.3
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4a1aa7f3fb5c4a2f8c7b6ac63c027183
work_keys_str_mv	AT prithwishdutta prominentmetallicsurfaceconductionandthesingularmagneticresponseoftopologicaldiracfermioninthreedimensionaltopologicalinsulatorbi15sb05te17se13 AT arnabpariari prominentmetallicsurfaceconductionandthesingularmagneticresponseoftopologicaldiracfermioninthreedimensionaltopologicalinsulatorbi15sb05te17se13 AT prabhatmandal prominentmetallicsurfaceconductionandthesingularmagneticresponseoftopologicaldiracfermioninthreedimensionaltopologicalinsulatorbi15sb05te17se13
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Prominent metallic surface conduction and the singular magnetic response of topological Dirac fermion in three-dimensional topological insulator Bi1.5Sb0.5Te1.7Se1.3

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