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Adiabatic quantum pump of spin-polarized current
Eduardo R Mucciolo1, Claudio Chamon, Charles M Marcus
1Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, C.P. 38071, 22452-970 Rio de Janeiro, Brazil.
Physical Review Letters
|October 9, 2002
Summary
We demonstrate a method to generate spin-polarized direct current (dc) from an open quantum dot using radio frequency gate voltages and a magnetic field. This approach leverages quantum effects in chaotic cavities for potential applications in spintronics.
Area of Science:
- Quantum physics
- Condensed matter physics
- Mesoscopic systems
Background:
- Quantum dots are semiconductor nanostructures with tunable electronic properties.
- Spin-polarized currents are crucial for spintronic devices.
- Chaotic cavities exhibit complex electron wave function behavior.
Purpose of the Study:
- To propose a novel mechanism for generating spin-polarized dc current.
- To explore the combination of quantum pumping and cavity chaos.
- To identify conditions for observing spin polarization.
Main Methods:
- Utilizing two ac (radio frequency) gate voltages to drive an open quantum dot.
- Applying a moderate in-plane magnetic field.
- Combining adiabatic quantum pumping with electron wave function fluctuations in chaotic cavities.
Main Results:
- A mechanism for generating spin-polarized, phase-coherent dc current is proposed.
- The generated current is driven by modulated gate voltages and a magnetic field.
- Spin polarization is predicted to be observable at specific temperature and Zeeman splitting energy scales.
Conclusions:
- The proposed mechanism offers a route to controlled spin-polarized current generation.
- The interplay between quantum pumping and cavity chaos is key to the effect.
- Experimental observation is feasible under conditions related to single-particle level spacing.