Magnetooptical determination of a topological index

Topological matter: magnetooptical characterization Opening a gap in a Dirac fermion system leads to the formation of a trivial or a non-trivial phase. A non-trivial phase exhibits conductive surface or edge states, and can be attributed to a non-zero topological index related to the parity of the c...

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Autores principales:	Badih A. Assaf, Thanyanan Phuphachong, Valentine V. Volobuev, Günther Bauer, Gunther Springholz, Louis-Anne de Vaulchier, Yves Guldner
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/e1a3818f22da4008abe9cf58435c14c9
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id	oai:doaj.org-article:e1a3818f22da4008abe9cf58435c14c9
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spelling	oai:doaj.org-article:e1a3818f22da4008abe9cf58435c14c92021-12-02T13:41:46ZMagnetooptical determination of a topological index10.1038/s41535-017-0028-52397-4648https://doaj.org/article/e1a3818f22da4008abe9cf58435c14c92017-05-01T00:00:00Zhttps://doi.org/10.1038/s41535-017-0028-5https://doaj.org/toc/2397-4648Topological matter: magnetooptical characterization Opening a gap in a Dirac fermion system leads to the formation of a trivial or a non-trivial phase. A non-trivial phase exhibits conductive surface or edge states, and can be attributed to a non-zero topological index related to the parity of the conduction and valence bands. This index is usually inferred from the characterization of the edge or surface states through angle resolved photoemission spectroscopy or quantum spin Hall effect. Now, an international team led by Yves Guldner at Ecole Normale Supérieure reports that the effective velocity of bulk massive Dirac fermions depends on the topological index. Infrared magnetooptical Landau level spectroscopy allows to accurately determining this velocity and therefore to directly extract the topological index, as exemplified with the 3D topological insulators Pb1-x Sn x Se and Pb1-x Sn x Te.Badih A. AssafThanyanan PhuphachongValentine V. VolobuevGünther BauerGunther SpringholzLouis-Anne de VaulchierYves GuldnerNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 2, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Badih A. Assaf Thanyanan Phuphachong Valentine V. Volobuev Günther Bauer Gunther Springholz Louis-Anne de Vaulchier Yves Guldner Magnetooptical determination of a topological index
description	Topological matter: magnetooptical characterization Opening a gap in a Dirac fermion system leads to the formation of a trivial or a non-trivial phase. A non-trivial phase exhibits conductive surface or edge states, and can be attributed to a non-zero topological index related to the parity of the conduction and valence bands. This index is usually inferred from the characterization of the edge or surface states through angle resolved photoemission spectroscopy or quantum spin Hall effect. Now, an international team led by Yves Guldner at Ecole Normale Supérieure reports that the effective velocity of bulk massive Dirac fermions depends on the topological index. Infrared magnetooptical Landau level spectroscopy allows to accurately determining this velocity and therefore to directly extract the topological index, as exemplified with the 3D topological insulators Pb1-x Sn x Se and Pb1-x Sn x Te.
format	article
author	Badih A. Assaf Thanyanan Phuphachong Valentine V. Volobuev Günther Bauer Gunther Springholz Louis-Anne de Vaulchier Yves Guldner
author_facet	Badih A. Assaf Thanyanan Phuphachong Valentine V. Volobuev Günther Bauer Gunther Springholz Louis-Anne de Vaulchier Yves Guldner
author_sort	Badih A. Assaf
title	Magnetooptical determination of a topological index
title_short	Magnetooptical determination of a topological index
title_full	Magnetooptical determination of a topological index
title_fullStr	Magnetooptical determination of a topological index
title_full_unstemmed	Magnetooptical determination of a topological index
title_sort	magnetooptical determination of a topological index
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e1a3818f22da4008abe9cf58435c14c9
work_keys_str_mv	AT badihaassaf magnetoopticaldeterminationofatopologicalindex AT thanyananphuphachong magnetoopticaldeterminationofatopologicalindex AT valentinevvolobuev magnetoopticaldeterminationofatopologicalindex AT guntherbauer magnetoopticaldeterminationofatopologicalindex AT guntherspringholz magnetoopticaldeterminationofatopologicalindex AT louisannedevaulchier magnetoopticaldeterminationofatopologicalindex AT yvesguldner magnetoopticaldeterminationofatopologicalindex
_version_	1718392586552475648

Magnetooptical determination of a topological index

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