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Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field
V S Khrapai1, E V Deviatov, A A Shashkin
1Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia.
Physical Review Letters
|October 4, 2000
Summary
We found a new quantum phase transition in a double-layer electron system. This transition occurs when magnetic fields compete with electron interactions, leading to a canted antiferromagnetic state.
Area of Science:
- Condensed Matter Physics
- Quantum Systems
- Materials Science
Background:
- Investigating electron systems in quantum wells is crucial for understanding fundamental physics.
- Tilted magnetic fields introduce complex interactions in two-dimensional electron systems.
- Quantum phase transitions offer insights into novel material states.
Purpose of the Study:
- To explore the ground states of a double-layer electron system in a parabolic quantum well.
- To analyze the behavior of this system under a tilted magnetic field at filling factor nu=2.
- To identify and characterize quantum phase transitions within this system.
Main Methods:
- Utilizing capacitance spectroscopy to probe the electron system.
- Applying a tilted magnetic field to tune system parameters.
- Analyzing the competition between ground states based on energy splittings.
Main Results:
- Observed competition between two ground states when Zeeman splitting is smaller than symmetric-antisymmetric splitting.
- Identified domain formation of competing states at the transition point.
- Measured a finite activation energy, indicating a novel insulator-insulator quantum phase transition.
Conclusions:
- The results support the prediction of a canted antiferromagnetic phase.
- This study reveals a new type of quantum phase transition in double-layer electron systems.
- Capacitance spectroscopy is effective in characterizing complex quantum states.