Phase coherent transport and spin-orbit interaction in GaAs/InSb core/shell nanowires
| Autor: | Hans Lüth, Mihail Ion Lepsa, Thomas Schäpers, Torsten Rieger, Johanna Janßen, G. Panaitov, Patrick Zellekens, Detlev Grützmacher, Natalia Demarina, Pujitha Perla |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanowire FOS: Physical sciences 02 engineering and technology 01 natural sciences symbols.namesake Condensed Matter::Materials Science Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering Quantum well Universal conductance fluctuations 010302 applied physics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Ambipolar diffusion Fermi level Spin–orbit interaction 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Magnetic flux Electronic Optical and Magnetic Materials Magnetic field symbols ddc:620 0210 nano-technology |
| Zdroj: | Semiconductor science and technology 35(8), 13 (2020). doi:10.1088/1361-6641/ab8396 |
| DOI: | 10.1088/1361-6641/ab8396 |
| Popis: | 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 Schr\"odinger--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. Comment: 19 pages, 9 figures, 1 table, title changed, additional datasets and plots |
| Databáze: | OpenAIRE |
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