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Preuves expérimentales d'un transport de surface sur un isolant topologique 3D HgTe/CdTe sus contrainte

Abstract : This report deal with caracterisation of magnetotransport in HgTe/CdTe structures bulk strained in that a topological surface transport is predicted. This new kind of material is a 3D topological insulator.In this thesis, I will explain what means 3D/2D topological insulator before focusing on II-VI system lijke HgTe/CdTe.Next, I will discuss about growing conditions performed in CEA/Leti and then material caracterisation by X-ray. Surfaces band structures were also, observed by ARPES, underligned in the report.A third part deal with Hall bars design and conception in order to emphasize topological behavior of these surfaces.The last part shows the results obtained on these Hall bars with magnetotransport at low and high magnetic field. Ambipolaire behaviour, non trivial Berry phase, weak antilocalization and the interger quantum hall effect in HgTe/CdTe structures are studied and a possible interpretation of these results are given.
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  • HAL Id : tel-01558284, version 1

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Clément Bouvier. Preuves expérimentales d'un transport de surface sur un isolant topologique 3D HgTe/CdTe sus contrainte. Science des matériaux [cond-mat.mtrl-sci]. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENY078⟩. ⟨tel-01558284⟩

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