TY  - JOUR
AU  - Zellekens, Patrick
AU  - Demarina, Nataliya
AU  - Janssen, Johanna
AU  - Rieger, Torsten
AU  - Lepsa, Mihail Ion
AU  - Perla, Pujitha
AU  - Panaitov, G.
AU  - Lüth, Hans
AU  - Grützmacher, Detlev
AU  - Schäpers, Thomas
TI  - Phase coherent transport and spin-orbit interaction in GaAs/InSb core/shell nanowires
JO  - Semiconductor science and technology
VL  - 35
IS  - 8
SN  - 0268-1242
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2020-01575
SP  - 13
PY  - 2020
AB  - Low-temperature magnetotransport measurements are performed on GaAs/InSb core-shell nanowires. The nanowires were self-catalyzed grown by molecular beam epitaxy. The conductance measurements as a function of back-gate voltage show an ambipolar behavior comprising an insulating range in between the transition from the p-type to the n-type region. Simulations based on a self-consistent Schrödinger--Poisson solver revealed that the ambipolar characteristics originate from a Fermi level dependent occupation of hole and electron states within the approximately circular quantum well formed in the InSb shell. By applying a perpendicular magnetic field with respect to the nanowire axis, conductance fluctuations were observed, which are used to extract the phase-coherence length. By averaging the magneto-conductance traces at different back-gate voltages, weak antilocalization features are resolved. Regular flux-periodic conductance oscillations are measured when an axial magnetic field is applied. These oscillations are attributed to closed-loop quantized states located in the InSb shell which shift their energetic position periodically with the magnetic flux. Possible reasons for experimentally observed variations in the oscillation patterns are discussed using simulation results.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1088/1361-6641/ab8396
UR  - https://juser.fz-juelich.de/record/874659
ER  -