Competition between Kondo Screening and Quantum Hall Edge Reconstruction.

Area of Science:

• Condensed Matter Physics
• Quantum Information Science
• Mesoscopic Physics

Background:

• Kondo effect in quantum dots is crucial for quantum information processing.
• Understanding g-factor renormalization is key to controlling quantum dot properties.
• Quantum Hall effect provides a unique regime to study electron interactions.

Purpose of the Study:

• Investigate g-factor renormalization in a Kondo-correlated quantum dot.
• Explore the influence of orbital effects and the quantum Hall regime.
• Analyze the interplay between Kondo screening and quantum Hall edge states.

Main Methods:

• Fabrication of a quantum dot coupled to two-dimensional leads.
• Application of magnetic fields parallel (Zeeman) and perpendicular (Quantum Hall) to the quantum dot.
• Measurement of transport properties, including zero-bias anomaly and Kondo temperature.

Main Results:

• Demonstrated g-factor renormalization in the pure Zeeman regime.
• Observed unusual suppression of the Kondo effect in the quantum Hall regime.
• Noted discontinuous changes in the split zero-bias anomaly with increasing magnetic field.

Conclusions:

• The quantum Hall edge structure significantly impacts Kondo screening and Kondo temperature.
• Electrostatic screening and edge properties (compressible/incompressible stripes) dictate Kondo effect behavior.
• The interplay between Kondo physics and quantum Hall states offers new avenues for quantum device control.