Exploring the Electronic Structure and Chemical Homogeneity of Individual Bi2Te3 Nanowires by Nano-Angle-Resolved Photoemission Spectroscopy.
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.
Materials Research Department, GSI Helmholtz Centre for Heavy Ion Research , Planckstr. 1, 64291 Darmstadt, Germany.|Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt , Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany.
Janina
J
Krieg
Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.|Université Paris Saclay, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.
Chaoyu
C
Chen
Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.|Université Paris Saclay, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.
José
J
Avila
Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt , Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany.|School of Physics, Beijing Institute of Technology , Beijing 100081, China.
Zeying
Z
Zhang
Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research , Heisenbergstr. 1, 70569 Stuttgart, Germany.
Wilfried
W
Sigle
Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt , Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany.
Hongbin
H
Zhang
Materials Research Department, GSI Helmholtz Centre for Heavy Ion Research , Planckstr. 1, 64291 Darmstadt, Germany.|Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt , Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany.
Christina
C
Trautmann
Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.|Université Paris Saclay, L'Orme des Merisiers Saint-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.
Maria Carmen
MC
Asensio
Materials Research Department, GSI Helmholtz Centre for Heavy Ion Research , Planckstr. 1, 64291 Darmstadt, Germany.
Maria Eugenia
ME
Toimil-Molares
Bi2Te3; electrochemical deposition; ion track technology; nanoangle-resolved photoemission spectroscopy (nano-ARPES); nanowire; topological insulator