Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V02: Topological Materials -- Mesoscopic and Novel Probes
2:30 PM–5:18 PM,
Thursday, March 7, 2019
BCEC
Room: 107A
Sponsoring
Unit:
DMP
Chair: Valla Fatemi, Yale Univ
Abstract: V02.00005 : Core-Shell Nanowires of 3D Topological Insulators
3:18 PM–3:30 PM
Presenter:
Kevin Geishendorf
(Leibniz IFW and TU Dresden)
Authors:
Kevin Geishendorf
(Leibniz IFW and TU Dresden)
Tommi Paavo Tynell
(Leibniz IFW)
Kornelius Nielsch
(Leibniz IFW and TU Dresden)
Andy Thomas
(Leibniz IFW)
One approach to achieve this reduction is to utilize band bending which occurs at the interface between two materials with different Fermi levels. The band bending leads to a charge depletion/ or accumulation near the interface. It therefore provides a tool to shift the fermi energy closer to the Dirac point.
In this work, we have grown core-shell NW using Vapor-Liquid-Solid (VLS) growth and Atomic Layer Deposition (ALD). As core material Bi2Se3 and as shell materials Al2O2 and Sb2Te3 were employed. The uniformity, crystallinity and composition of those core-shell NW was investigated using transmission electron microscopy, nanodiffraction and EDX. Furthermore, devices for transport experiments were built using optical lithography and lift-off techniques. With those devices magneto transport measurements have been performed revealing quantum interference effects such as weak-antilocalization and universal conductance fluctuations.
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