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Title: One-dimensional edge transport on the surface of cylindrical Bi{sub x}Te{sub 3−y}Se{sub y} nanowires in transverse magnetic fields

Abstract

The geometry of topological insulators (TIs) has a major impact on the magnetoelectric band structure of their surface states. Here, we investigate the surface states of cylindrical TI bismuth telluride selenide nanowires with three different diameters, by parallel and transverse magnetoresistance (MR) measurements. In parallel configuration, we observe Aharonov-Bohm oscillations as well as weak antilocalization, indicating two-dimensional TI surface states. In transverse magnetic fields, we observed MR oscillations that are non-linear against the reciprocal of the magnetic field and thus cannot be explained by two- or three-dimensional states. Instead, our transport data analysis reveals that these MR oscillations are the consequence of one-dimensional edge channels at the nanowire surface that form due to the projection of the external magnetic field on the cylindrically curved surface plane in high magnetic fields. Our observation provides an exotic class of surface states that might be used for electronic and spintronic devices.

Authors:
; ; ; ; ;  [1]; ;  [1];  [2]
  1. Institute of Nanostructure and Solid State Physics, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
22485986
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AHARONOV-BOHM EFFECT; CYLINDRICAL CONFIGURATION; DATA ANALYSIS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; NANOWIRES; SURFACES; TITANIUM SULFIDES; TWO-DIMENSIONAL SYSTEMS

Citation Formats

Bäßler, Svenja, E-mail: sbaessle@physnet.uni-hamburg.de, Hamdou, Bacel, Sergelius, Philip, Michel, Ann-Kathrin, Zierold, Robert, Gooth, Johannes, Reith, Heiko, Nielsch, Kornelius, and Leibniz Institute for Solid State and Materials Research Dresden, PO Box 270116, 01171 Dresden. One-dimensional edge transport on the surface of cylindrical Bi{sub x}Te{sub 3−y}Se{sub y} nanowires in transverse magnetic fields. United States: N. p., 2015. Web. doi:10.1063/1.4935244.
Bäßler, Svenja, E-mail: sbaessle@physnet.uni-hamburg.de, Hamdou, Bacel, Sergelius, Philip, Michel, Ann-Kathrin, Zierold, Robert, Gooth, Johannes, Reith, Heiko, Nielsch, Kornelius, & Leibniz Institute for Solid State and Materials Research Dresden, PO Box 270116, 01171 Dresden. One-dimensional edge transport on the surface of cylindrical Bi{sub x}Te{sub 3−y}Se{sub y} nanowires in transverse magnetic fields. United States. doi:10.1063/1.4935244.
Bäßler, Svenja, E-mail: sbaessle@physnet.uni-hamburg.de, Hamdou, Bacel, Sergelius, Philip, Michel, Ann-Kathrin, Zierold, Robert, Gooth, Johannes, Reith, Heiko, Nielsch, Kornelius, and Leibniz Institute for Solid State and Materials Research Dresden, PO Box 270116, 01171 Dresden. Mon . "One-dimensional edge transport on the surface of cylindrical Bi{sub x}Te{sub 3−y}Se{sub y} nanowires in transverse magnetic fields". United States. doi:10.1063/1.4935244.
@article{osti_22485986,
title = {One-dimensional edge transport on the surface of cylindrical Bi{sub x}Te{sub 3−y}Se{sub y} nanowires in transverse magnetic fields},
author = {Bäßler, Svenja, E-mail: sbaessle@physnet.uni-hamburg.de and Hamdou, Bacel and Sergelius, Philip and Michel, Ann-Kathrin and Zierold, Robert and Gooth, Johannes and Reith, Heiko and Nielsch, Kornelius and Leibniz Institute for Solid State and Materials Research Dresden, PO Box 270116, 01171 Dresden},
abstractNote = {The geometry of topological insulators (TIs) has a major impact on the magnetoelectric band structure of their surface states. Here, we investigate the surface states of cylindrical TI bismuth telluride selenide nanowires with three different diameters, by parallel and transverse magnetoresistance (MR) measurements. In parallel configuration, we observe Aharonov-Bohm oscillations as well as weak antilocalization, indicating two-dimensional TI surface states. In transverse magnetic fields, we observed MR oscillations that are non-linear against the reciprocal of the magnetic field and thus cannot be explained by two- or three-dimensional states. Instead, our transport data analysis reveals that these MR oscillations are the consequence of one-dimensional edge channels at the nanowire surface that form due to the projection of the external magnetic field on the cylindrically curved surface plane in high magnetic fields. Our observation provides an exotic class of surface states that might be used for electronic and spintronic devices.},
doi = {10.1063/1.4935244},
journal = {Applied Physics Letters},
number = 18,
volume = 107,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2015},
month = {Mon Nov 02 00:00:00 EST 2015}
}
  • The dependence of the electrical conductivity, thermoelectric power and figure of merit on the grain size in cold pressed Bi{sub 1.8}Sb{sub 0.2{minus}{ital x}}In{sub {ital x}}Te{sub 2.85}Se{sub 0.15}, where {ital x}=0, 0.01, 0.02 was measured. The influence of the indium content and grain size on the thermoelectric properties is discussed. In this materials the changes of the free carrier concentration are due to the interaction between antisite-defects and vacancies during the sintering. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
  • In this study, we used low-energy, momentum-resolved inelastic electron scattering to study surface collective modes of the three-dimensional topological insulators Bi 2Se 3 and Bi 0.5Sb 1.5Te 3-xSe x. Our goal was to identify the “spin plasmon” predicted by Raghu and co-workers [Phys. Rev. Lett. 104, 116401 (2010)]. Instead, we found that the primary collective mode is a surface plasmon arising from the bulk, free carriers in these materials. This excitation dominates the spectral weight in the bosonic function of the surface χ''(q,ω) at THz energy scales, and is the most likely origin of a quasiparticle dispersion kink observed inmore » previous photoemission experiments. Our study suggests that the spin plasmon may mix with this other surface mode, calling for a more nuanced understanding of optical experiments in which the spin plasmon is reported to play a role.« less
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