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Highly anisotropic g-factor of two-dimensional hole systems
Winkler1, Papadakis, De Poortere EP
1Institut fur Technische Physik III, Universitat Erlangen-Nurnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
Physical Review Letters
|November 18, 2000
Summary
Spin-orbit coupling in 2D hole systems causes highly anisotropic Zeeman splitting. This effect, unique to 2D materials, was confirmed in GaAs experiments.
Area of Science:
- Condensed matter physics
- Spintronics
- Two-dimensional materials
Background:
- Spin-orbit coupling influences electron behavior in materials.
- Anisotropic properties arise from specific material structures and symmetries.
- Two-dimensional (2D) hole systems exhibit unique electronic behaviors.
Purpose of the Study:
- Investigate the anisotropic Zeeman splitting in 2D hole systems.
- Explore the coupling between spin and orbital motion in these systems.
- Compare theoretical predictions with experimental data.
Main Methods:
- Utilized GaAs 2D hole systems grown on (113) substrates.
- Applied in-plane magnetic fields at various orientations relative to crystal axes.
- Measured anisotropic depopulation of spin subbands.
Main Results:
- Observed highly anisotropic Zeeman splitting dependent on magnetic field orientation.
- Demonstrated a mechanism with no analog in bulk band structures.
- Achieved good qualitative agreement between theoretical models and experimental findings.
Conclusions:
- The spin degree of freedom strongly couples to anisotropic orbital motion in 2D hole systems.
- This coupling leads to orientation-dependent Zeeman effects.
- Experimental results validate the theoretical understanding of this 2D spintronic phenomenon.
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