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Sub-Band Spectrum Engineering via Structural Order in Tapered Nanowires
Man Suk Song1, Tom Koren1, Magdalena Załuska-Kotur2
1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Nano Letters
|December 9, 2021
Summary
Researchers developed a method to create kinked nanowires, forming tapered structures ideal for topological superconductivity. These unique nanoflags show promise for realizing and manipulating Majorana zero modes.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Nanowires offer a platform for one-dimensional topological superconductivity due to their electronic subband quantization.
- Controlling nanowire geometry is crucial for realizing advanced quantum phenomena.
Purpose of the Study:
- To develop a protocol for creating kinked nanowires with tapered structures.
- To investigate the structural and electronic properties of these novel nanowires.
- To explore their potential for Majorana zero-mode realization.
Main Methods:
- Inducing kinks in nanowires to alter growth direction and form nanoplate structures.
- Structural characterization using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
- Spectroscopic analysis via scanning tunneling microscopy and spectroscopy (STM/STS).
- Atomically resolved topography and computational modeling (simulations).
Main Results:
- Successfully fabricated kinked nanowires that transition into tapered structures with square tips.
- Observed ordered atomic rows on the (110) facet of the resulting nanoflag structure.
- Characterized the unique geometry and atomic arrangement through advanced microscopy and simulations.
Conclusions:
- Tapered InAs nanowires present a promising platform for the realization and manipulation of Majorana zero modes.
- The developed protocol offers a new route to engineer complex nanowire geometries for quantum applications.
- The observed atomic structures provide insights into growth mechanisms and potential device fabrication.
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