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Exploring the Electronic Structure and Chemical Homogeneity of Individual Bi2Te3 Nanowires by Nano-Angle-Resolved Photoemission Spectroscopy

Krieg, Janina and Chen, Chaoyu and Avila, José and Zhang, Zeying and Sigle, Wilfried and Zhang, Hongbin and Trautmann, Christina and Asensio, Maria Carmen and Toimil-Molares, Maria Eugenia (2016):
Exploring the Electronic Structure and Chemical Homogeneity of Individual Bi2Te3 Nanowires by Nano-Angle-Resolved Photoemission Spectroscopy.
In: Nano Letters, American Chemical Society, pp. 4001-4007, 16, (7), ISSN 1530-6984, DOI: 10.1021/acs.nanolett.6b00400, [Online-Edition: https://doi.org/10.1021/acs.nanolett.6b00400],
[Article]

Abstract

Due to their high surface-to-volume ratio, cylindrical Bi2Te3 nanowires are employed as model systems to investigate the chemistry and the unique conductive surface states of topological insulator nanomaterials. We report on nanoangle-resolved photoemission spectroscopy (nano-ARPES) characterization of individual cylindrical Bi2Te3 nanowires with a diameter of 100 nm. The nanowires are synthesized by electrochemical deposition inside channels of ion-track etched polymer membranes. Core level spectra recorded with submicron resolution indicate a homogeneous chemical composition along individual nanowires, while nano-ARPES intensity maps reveal the valence band structure at the single nanowire level. First-principles electronic structure calculations for chosen crystallographic orientations are in good agreement with those revealed by nano-ARPES. The successful application of nano-ARPES on single one-dimensional nanostructures constitutes a new avenue to achieve a better understanding of the electronic structure of topological insulator nanomaterials.

Item Type: Article
Erschienen: 2016
Creators: Krieg, Janina and Chen, Chaoyu and Avila, José and Zhang, Zeying and Sigle, Wilfried and Zhang, Hongbin and Trautmann, Christina and Asensio, Maria Carmen and Toimil-Molares, Maria Eugenia
Title: Exploring the Electronic Structure and Chemical Homogeneity of Individual Bi2Te3 Nanowires by Nano-Angle-Resolved Photoemission Spectroscopy
Language: English
Abstract:

Due to their high surface-to-volume ratio, cylindrical Bi2Te3 nanowires are employed as model systems to investigate the chemistry and the unique conductive surface states of topological insulator nanomaterials. We report on nanoangle-resolved photoemission spectroscopy (nano-ARPES) characterization of individual cylindrical Bi2Te3 nanowires with a diameter of 100 nm. The nanowires are synthesized by electrochemical deposition inside channels of ion-track etched polymer membranes. Core level spectra recorded with submicron resolution indicate a homogeneous chemical composition along individual nanowires, while nano-ARPES intensity maps reveal the valence band structure at the single nanowire level. First-principles electronic structure calculations for chosen crystallographic orientations are in good agreement with those revealed by nano-ARPES. The successful application of nano-ARPES on single one-dimensional nanostructures constitutes a new avenue to achieve a better understanding of the electronic structure of topological insulator nanomaterials.

Journal or Publication Title: Nano Letters
Volume: 16
Number: 7
Publisher: American Chemical Society
Uncontrolled Keywords: Bi2Te3, electrochemical Deposition, ion track technology, nanoangle-resolved photoemission spectroscopy (nano-ARPES), nanowire, topological insulator
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science > Theory of Magnetic Materials
Date Deposited: 29 Dec 2017 09:23
DOI: 10.1021/acs.nanolett.6b00400
Official URL: https://doi.org/10.1021/acs.nanolett.6b00400
Funders: This work was supported by the SOLEIL synchrotron under the proposal 20130543., J.K. and M.E.T.-M. acknowledge support by the DFG Priority Program SPP 1666., J.K. acknowledges support by the graduate school HGS-HIRe., Z.Z. is funded by the International Graduate Exchange Program of Beijing Institute of Technology.
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