Spin-Resolved Magneto-Tunneling and Giant Anisotropic g-Factor in Broken Gap InAs-GaSb Core-Shell Nanowires

Area of Science:

• Condensed Matter Physics
• Nanoscience and Nanotechnology
• Spintronics

Background:

• Semiconductor core-shell nanowires offer unique platforms for exploring quantum phenomena.
• Heterojunctions between materials like Indium Arsenide (InAs) and Gallium Antimonide (GaSb) exhibit interesting electronic properties.

Purpose of the Study:

• To experimentally and computationally investigate magneto-conductance in InAs-GaSb core-shell nanowires.
• To understand the role of magnetic fields and temperature on spin-polarized transport.
• To determine the g-factor of these heterojunctions.

Main Methods:

• Measurements of magneto-conductance under magnetic fields up to 30 Tesla and temperatures from 4.2 K to 200 K.
• Computational modeling using envelope function approximation and a semiclassical (WKB) approach.
• Analysis of spin-polarized currents and differential conductance (dI/dV).

Main Results:

• Observed double-peak negative differential conductance that blue-shifts with increasing magnetic field (B).
• Demonstrated strong anisotropy of the conductance with respect to B orientation and significant temperature dependence.
• Extracted a giant, anisotropic g-factor exceeding 60 (radial) and 100 (tilted) for the heterojunction.

Conclusions:

• The study elucidates spin-polarized transport mechanisms in InAs-GaSb nanowire heterojunctions.
• The extracted giant g-factor has significant implications for spintronic device applications.
• Understanding these magneto-transport properties is key for future nanoscale electronic devices.