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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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Published on: April 28, 2016

Zeeman splitting in ballistic hole quantum wires.

R Danneau¹, O Klochan, W R Clarke

¹School of Physics, University of New South Wales, Sydney 2052, Australia. r.danneau@unsw.edu.au

Physical Review Letters

|August 16, 2006

Summary

We observed significant Zeeman splitting in quantum wires, showing spin degeneracy lifting when a magnetic field is applied parallel to the wire. This highlights quantum confinement

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Area of Science:

Condensed matter physics
Nanotechnology
Spintronics

Background:

Quantum wells and quantum wires are crucial nanostructures for electronic devices.
Spin-orbit coupling in low-dimensional systems influences electron behavior.
Zeeman splitting is a fundamental phenomenon in understanding magnetic properties.

Purpose of the Study:

Investigate Zeeman splitting in ballistic hole quantum wires.
Analyze the effect of in-plane magnetic fields on spin degeneracy.
Determine the influence of quantum confinement on spin splitting anisotropy.

Main Methods:

Fabrication of ballistic hole quantum wires using surface gate confinement in a (311)A quantum well.
Transport measurements to probe electronic properties.
Application of in-plane magnetic fields parallel and perpendicular to the quantum wire.

Main Results:

Observed lifting of spin degeneracy and subband crossings with a parallel magnetic field.
No discernible spin splitting when the magnetic field was perpendicular (up to 8.8 T).
Demonstrated significant Zeeman splitting anisotropy in the studied hole quantum wires.

Conclusions:

Quantum confinement plays a critical role in spin splitting within nanostructures.
The observed anisotropy is linked to strong spin-orbit coupling in the hole quantum wires.
Results provide insights into spintronic applications utilizing quantum confinement effects.