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ac-Driven double quantum dots as spin pumps and spin filters
Ernesto Cota1, Ramón Aguado, Gloria Platero
1Centro de Ciencias de la Materia Condensada - UNAM, Ensenada, Mexico.
Physical Review Letters
|March 24, 2005
Summary
We introduce a novel method using ac-driven double quantum dots to control spin filtering and spin pumping. The spin polarization of electrical current can be precisely tuned by adjusting the ac field parameters.
Area of Science:
- Quantum dots
- Spintronics
- Condensed matter physics
Background:
- Quantum dots are semiconductor nanocrystals with tunable electronic properties.
- Spintronics aims to utilize electron spin for novel electronic devices.
- Coulomb blockade is a phenomenon in nanoscale conductors that restricts electron tunneling.
Purpose of the Study:
- To propose and analyze a new scheme for spin filtering and spin pumping.
- To demonstrate control over spin polarization using ac-driven double quantum dots.
- To investigate the impact of spin relaxation and decoherence on pumped current.
Main Methods:
- Theoretical analysis of ac-driven double quantum dots.
- Calculation of current in the sequential tunneling regime.
- Investigation of Coulomb blockade effects.
Main Results:
- Demonstrated realization of spin filtering and spin pumping.
- Showcased tunability of spin polarization via ac field parameters (amplitude and frequency).
- Analyzed the influence of spin relaxation and decoherence on the pumped current.
Conclusions:
- The proposed scheme offers a viable method for controlling spin-polarized currents.
- Ac-driven double quantum dots are promising for spintronic applications.
- Understanding spin dynamics is crucial for optimizing device performance.