Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure

Abstract We perform ab initio investigations of the bulk and surface band structures of LaSb and LaBi and resolve the existing disagreements about the topological property of LaSb, considering LaBi as a reference. We examine the bulk band structure for band inversion, along with the stability of sur...

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Autores principales:	Urmimala Dey, Monodeep Chakraborty, A. Taraphder, Sumanta Tewari
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Surface Dirac Cone Band Inversion Bulk Band Structure Alternative Unit Cell Topological Protection Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b876ca68c51e41969a4ffa495433b4cb
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id	oai:doaj.org-article:b876ca68c51e41969a4ffa495433b4cb
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spelling	oai:doaj.org-article:b876ca68c51e41969a4ffa495433b4cb2021-12-02T11:41:26ZBulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure10.1038/s41598-018-33273-62045-2322https://doaj.org/article/b876ca68c51e41969a4ffa495433b4cb2018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-33273-6https://doaj.org/toc/2045-2322Abstract We perform ab initio investigations of the bulk and surface band structures of LaSb and LaBi and resolve the existing disagreements about the topological property of LaSb, considering LaBi as a reference. We examine the bulk band structure for band inversion, along with the stability of surface Dirac cones (if any) to time-reversal-preserving perturbations, as a strong diagnostic test for determining the topological character of LaSb, LaBi and LaSb-LaBi multilayer. A detailed ab initio investigation of a multilayer consisting of alternating unit cells of LaSb and LaBi shows the presence of band inversion in the bulk and a massless Dirac cone on the (001) surface, which remains stable under the influence of time-reversal-preserving perturbations, thus confirming the topologically non-trivial nature of the multilayer in which the electronic properties can be tailored as per requirement. A detailed $${{\mathbb{Z}}}_{2}$$ Z2 invariant calculation is performed to arrive at a holistic conclusion.Urmimala DeyMonodeep ChakrabortyA. TaraphderSumanta TewariNature PortfolioarticleSurface Dirac ConeBand InversionBulk Band StructureAlternative Unit CellTopological ProtectionMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Surface Dirac Cone Band Inversion Bulk Band Structure Alternative Unit Cell Topological Protection Medicine R Science Q
spellingShingle	Surface Dirac Cone Band Inversion Bulk Band Structure Alternative Unit Cell Topological Protection Medicine R Science Q Urmimala Dey Monodeep Chakraborty A. Taraphder Sumanta Tewari Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
description	Abstract We perform ab initio investigations of the bulk and surface band structures of LaSb and LaBi and resolve the existing disagreements about the topological property of LaSb, considering LaBi as a reference. We examine the bulk band structure for band inversion, along with the stability of surface Dirac cones (if any) to time-reversal-preserving perturbations, as a strong diagnostic test for determining the topological character of LaSb, LaBi and LaSb-LaBi multilayer. A detailed ab initio investigation of a multilayer consisting of alternating unit cells of LaSb and LaBi shows the presence of band inversion in the bulk and a massless Dirac cone on the (001) surface, which remains stable under the influence of time-reversal-preserving perturbations, thus confirming the topologically non-trivial nature of the multilayer in which the electronic properties can be tailored as per requirement. A detailed $${{\mathbb{Z}}}_{2}$$ Z2 invariant calculation is performed to arrive at a holistic conclusion.
format	article
author	Urmimala Dey Monodeep Chakraborty A. Taraphder Sumanta Tewari
author_facet	Urmimala Dey Monodeep Chakraborty A. Taraphder Sumanta Tewari
author_sort	Urmimala Dey
title	Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
title_short	Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
title_full	Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
title_fullStr	Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
title_full_unstemmed	Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure
title_sort	bulk band inversion and surface dirac cones in lasb and labi: prediction of a new topological heterostructure
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/b876ca68c51e41969a4ffa495433b4cb
work_keys_str_mv	AT urmimaladey bulkbandinversionandsurfacediracconesinlasbandlabipredictionofanewtopologicalheterostructure AT monodeepchakraborty bulkbandinversionandsurfacediracconesinlasbandlabipredictionofanewtopologicalheterostructure AT ataraphder bulkbandinversionandsurfacediracconesinlasbandlabipredictionofanewtopologicalheterostructure AT sumantatewari bulkbandinversionandsurfacediracconesinlasbandlabipredictionofanewtopologicalheterostructure
_version_	1718395422451433472

Bulk band inversion and surface Dirac cones in LaSb and LaBi: Prediction of a new topological heterostructure

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