Nano-Angle Resolved Photoemission Spectroscopy on Topological insulator Sb2Te3 nanowires responsible of quantum transport

33rd International Conference on the Physics of Semiconductors

Avila, José^1 ; Chen, Chaoyu^1 ; Arango, Yulieth C.^2 ; Huang, Liubing^3 ; Grützmacher, Detlev^2 ; Lüth, Hans^2 ; Lu, J. Grace^3 ; Schäpers, Thomas^2 ; Asensio, Maria C.^1

ANTARES Beamline, Synchrotron SOLEIL, Université Paris-Saclay, L'Orme des Merisiers, Saint Aubin-BP 48, Gif sur Yvette Cedex

91192, France^1

Peter Grünberg Institute (PGI-9), JARA Jülich-Aachen Research Alliance, Research Centre Jülich GmbH, Jülich

52425, Germany^2

Department of Physics and Astronomy, University of Southern California, Los Angeles

CA

90089, United States^3

关键词: Angle resolved photoemission spectroscopy;    Bulk state;    High resolution;    Magnetoresistance measurements;    Quantum transport;    Topological insulators;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/864/1/012041/pdf
DOI  :  10.1088/1742-6596/864/1/012041

来源: IOP

【 摘 要 】

Using high-resolution Nano-Angle Resolved Photoemission Spectroscopy (Nano-ARPES), we have determined the electronic structure of the surface and bulk states of topological insulator Sb2Te3nanowires, which have been also characterized by magnetoresistance measurements. The observed Aharonov-Bohm-type oscillations could be unambiguously related to the transport by topological protected surface states directly recorded by photoemission. We have measured Nano-ARPES on individual nanowires of a few nanometers wide to provide direct evidence of the existence of the nontrivial topological surface states, as well as their doping. Our findings are consistent with theoretical predictions and confirm that the surface states of intrinsically doped unidimensional topological insulator nanowires are responsible for the quantum transport.