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Published on: August 2, 2019
Magnetic field driven interminiband charge transfer in InGaAs/InP superlattices.
Yu A Pusep1, B G M Tavares, M A Tito
1Instituto de Fisica de São Carlos, Universidade de São Paulo, 13560-970 Sao Carlos, SP, Brazil.
In InGaAs/InP superlattices, researchers observed magnetic field effects on minibands during the quantum Hall effect. These findings provide evidence for correlated states in multi-component electron systems at odd filling factors.
Area of Science:
- Condensed Matter Physics
- Semiconductor Nanostructures
- Quantum Phenomena
Background:
- Minibands in semiconductor superlattices govern electron behavior.
- The integer quantum Hall effect (IQHE) reveals quantized electrical conductance.
- Understanding electron interactions in confined systems is crucial.
Purpose of the Study:
- To investigate miniband energies, occupancies, and polarizations in InGaAs/InP superlattices.
- To study electron tunneling and behavior under the IQHE regime.
- To explore the formation of correlated states in multi-component electron systems.
Main Methods:
- Utilizing polarization-resolved photoluminescence spectroscopy.
- Applying magnetic fields to induce and study quantum Hall states.
- Analyzing electron tunneling dynamics (Γ-Γ and Γ-Xz) within the superlattice structure.
Main Results:
- Observed magnetic field-induced shrinkage of the interminiband gap.
- Detected charge redistribution across superlattice minibands at odd filling factors.
- Noted depolarization of quantum Hall electron states and similarity to GaAs/AlGaAs systems.
Conclusions:
- The study confirms theoretical predictions of magnetic field effects on miniband gaps.
- Results demonstrate the formation of correlated states in multi-component electron systems.
- Electron behavior in InGaAs/InP superlattices mirrors that in GaAs/AlGaAs double quantum wells.
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