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Integration of the Rhombohedral BiSb(0001) Topological Insulator on a Cubic GaAs(001) Substrate
Dima Sadek1, Daya S Dhungana1, Roland Coratger2
1LAAS-CNRS, Université de Toulouse, Toulouse F-31400, France.
ACS Applied Materials & Interfaces
|July 23, 2021
Summary
Bismuth-antimony alloy (BiSb) topological insulators were integrated onto gallium arsenide (GaAs) substrates. This breakthrough enables spintronic applications by achieving high-quality 2D integration of these promising materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Bismuth-antimony alloy (BiSb) is a key 3D topological insulator (TI) with significant potential for spintronic applications.
- Existing challenges include the lack of 2D integration of TIs on industrial standards.
Purpose of the Study:
- To report the successful integration of high-quality rhombohedral BiSb(0001) topological insulators on a cubic GaAs(001) substrate.
- To demonstrate the feasibility of 2D integration for advanced spintronic devices.
Main Methods:
- Epitaxial growth of BiSb on GaAs(001) substrates.
- Characterization of the interface and material properties using advanced techniques.
Main Results:
- Demonstrated a clear epitaxial relationship and a fully relaxed BiSb topological insulator layer.
- Achieved controlled antimony composition across the BiSb layer.
- Observed a semiconductor band structure at room temperature and metallic surface states at 77 K.
Conclusions:
- Successful integration of BiSb topological insulators on GaAs substrates paves the way for industrial spintronic applications.
- The achieved material quality and controlled properties are crucial for developing low-current spin-orbit-torque devices.
