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Published on: December 3, 2013
Anisotropic phase coherence in GaAs/InAs core/shell nanowires
Fabian Haas1,2, Patrick Zellekens1,2, Tobias Wenz1,2
1Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, D-52425 Jülich, Germany.
Low-temperature transport in GaAs/InAs core/shell nanowires exhibits phase-coherent effects. These quantum phenomena, observed up to 55 K, reveal anisotropic phase coherence lengths influenced by crystal structure.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Low-temperature electrical transport in nanowires is governed by quantum mechanical effects.
- Phase coherence, crucial for quantum transport, influences conductance modulation in magnetic fields.
Purpose of the Study:
- To investigate phase-coherent transport phenomena in GaAs/InAs core/shell nanowires.
- To analyze the phase coherence length and its anisotropy in these nanostructures.
Main Methods:
- Measurements of low-temperature electrical transport in GaAs/InAs core/shell nanowires.
- Application of external magnetic fields parallel and perpendicular to the nanowire axis.
- Temperature-dependent measurements to determine phase coherence lengths.
Main Results:
- Observed h/e flux periodic oscillations (parallel field) and aperiodic universal conductance fluctuations (perpendicular field).
- Derived anisotropic phase coherence lengths in both cross-sectional and longitudinal directions.
- Detected flux periodic oscillations up to 55 K in nanowires with a 45 nm radius.
Conclusions:
- The observed anisotropy in phase coherence is attributed to the crystal structure of GaAs/InAs core/shell nanowires.
- Electron interference effects provide a sensitive probe for analyzing phase coherence in nanowire systems.
- Quantum transport phenomena persist to relatively high temperatures in these engineered nanowires.
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