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Spin-selective Aharonov-Bohm oscillations in a lateral triple quantum dot
F Delgado1, Y-P Shim, M Korkusinski
1Institute for Microstructural Sciences, National Research Council, Ottawa, Ontario, Canada K1A 0R6.
Physical Review Letters
|December 31, 2008
Summary
We explored spin-selective Aharonov-Bohm oscillations in a triple quantum dot. The study reveals that electron spin, not just charge, influences the Aharonov-Bohm effect, leading to a tunable spin valve behavior.
Area of Science:
- Quantum physics
- Condensed matter physics
- Spintronics
Background:
- The Aharonov-Bohm (AB) effect describes the quantum mechanical phenomenon where a charged particle is affected by an electromagnetic potential, even in regions where there is no magnetic field.
- Understanding electron behavior in quantum dot systems is crucial for developing next-generation electronic devices.
Purpose of the Study:
- To develop a theory for spin-selective Aharonov-Bohm oscillations in a lateral triple quantum dot system.
- To investigate the role of electron spin in the Aharonov-Bohm effect within interacting electron systems in a triple quantum dot molecule (TQD).
Main Methods:
- Utilizing a Hubbard model for theoretical analysis.
- Performing microscopic calculations to support the theoretical model.
- Simulating electron transport through a triple quantum dot molecule in a ring configuration.
Main Results:
- The Aharonov-Bohm (AB) effect in a TQD molecule is shown to be dependent on both electron charge and spin.
- Localizing a single electron spin in one dot influences the current based on the relative spin orientation.
- Aharonov-Bohm oscillations are predicted exclusively for the spin singlet electron complex.
Conclusions:
- The findings demonstrate that electron spin plays a critical role in the Aharonov-Bohm effect in interacting TQD systems.
- The system exhibits characteristics of a magnetic field-tunable "spin valve," where current is controlled by spin orientation.
- This research opens avenues for spintronic applications utilizing spin-dependent quantum interference effects.
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