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Two-Dimensional Quantum Transport in Free-Standing InSb Nanosheets
Ning Kang1, Dingxun Fan1, Jinhua Zhi1
1Beijing Key Laboratory of Quantum Devices, Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics , Peking University , Beijing 100871 , China.
Nano Letters
|December 19, 2018
Summary
This study explores two-dimensional (2D) indium antimonide (InSb) nanosheets for topological quantum computing. These 2D InSb systems exhibit strong spin-orbit coupling and form high-quality superconductor junctions, advancing topological device development.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Computing
Background:
- Low-dimensional III-V semiconductors like InAs and InSb are key for Majorana zero modes and topological quantum computation.
- Current research primarily uses 1D nanowires, limiting complex topological circuit construction.
- High-mobility 2D electron systems with strong spin-orbit coupling are needed for scalable topological quantum computing.
Purpose of the Study:
- Investigate quantum transport in high-mobility 2D InSb nanosheets.
- Demonstrate the potential of 2D InSb for topological quantum devices.
- Explore InSb nanosheet-superconductor junctions.
Main Methods:
- Molecular-beam epitaxy for InSb nanosheet growth.
- Shubnikov-de Haas oscillations and quantum Hall state measurements.
- Angular dependence of magnetotransport and low-field magnetotransport (weak antilocalization).
Main Results:
- Confirmed 2D nature of electronic states in InSb nanosheets via transport measurements.
- Verified strong spin-orbit coupling through weak antilocalization.
- Fabricated high-quality InSb nanosheet-superconductor junctions with transparent interfaces.
Conclusions:
- 2D InSb nanosheets are a promising platform for studying quantum transport and topological phenomena.
- These findings facilitate the development of advanced hybrid topological devices.
- Opens new avenues for scalable topological quantum computing architectures.
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