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Published on: June 28, 2018
Spin-orbit interaction in symmetric wells with two subbands
Esmerindo Bernardes1, John Schliemann, Minchul Lee
1Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, São Paulo, Brazil.
We discovered a new spin-orbit interaction in two-dimensional electron gases. This interaction, arising from distinct electron states, leads to unique spin-Hall conductivity and Zitterbewegung without magnetic fields.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Materials science
Background:
- Spin-orbit (SO) interaction is crucial for spintronic devices.
- Existing models often rely on structural asymmetry.
- Two-dimensional electron gases (2DEGs) in quantum wells are key platforms for studying SO effects.
Purpose of the Study:
- To investigate a novel intersubband-induced SO interaction in 2DEGs.
- To explore the properties and implications of this new SO term.
- To determine its effect on spin-Hall conductivity and electron dynamics.
Main Methods:
- Utilized the 8x8 Kane model for theoretical derivation.
- Self-consistently calculated the SO coupling strength for realistic quantum wells.
- Analyzed the resulting spin-Hall conductivity and Zitterbewegung phenomena.
Main Results:
- Derived a new intersubband-induced SO term, functional form similar to Rashba SO.
- This term is non-zero even in symmetric structures due to distinct state parity.
- Calculated SO coupling strength comparable to the Rashba constant.
- Observed a non-zero ballistic spin-Hall conductivity dependent on Fermi energy.
- Predicted unusual Zitterbewegung with cycloidal trajectories without magnetic fields.
Conclusions:
- The newly identified SO interaction offers a new mechanism for spin manipulation in 2DEGs.
- This finding has implications for designing novel spintronic devices and understanding quantum phenomena.
- The absence of required structural asymmetry simplifies device fabrication and broadens applicability.
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