Resonant tunneling-based spin ratchets
arXiv:0904.1518 · doi:10.1209/0295-5075/87/17001
Abstract
We outline a generic ratchet mechanism for creating directed spin-polarized currents in ac-driven double well or double dot structures by employing resonant spin transfer through the system engineered by local external magnetic fields. We show its applicability to semiconductor nanostructures by considering coherent transport through two coupled lateral quantum dots, where the energy levels of the two dots exhibit opposite Zeeman spin splitting. We perform numerical quantum mechanical calculations for the I-V characteristics of this system in the nonlinear regime, which requires a self-consistent treatment of the charge redistribution due to the applied finite bias. We show that this setting enables nonzero averaged net spin currents in the absence of net charge transport.
5 pages, 4 figures
References in corpus (20)
- Artificial Brownian motors: Controlling transport on the nanoscale
- First-Principles Based Matrix-Green's Function Approach to Molecular Electronic Devices: General Formalism
- Experimental Realization of a Quantum Spin Pump
- Voltage-Controlled Spin Selection in a Magnetic Resonant Tunnelling Diode
- An Adiabatic Quantum Pump of Spin Polarized Current
- AC-driven double quantum dots as spin pumps and spin filters
- A spin-cell for spin current
- Pumping spin with electrical fields
- Mesoscopic effects in adiabatic spin pumping
- Effects of short-range interactions on transport through quantum point contacts: A numerical approach
- On the electrostatic potential profile in biased molecular wires
- Resonant Tunneling Magneto Resistance in Coupled Quantum Wells
- Quantum dissipative Rashba spin ratchets
- Zeeman ratchets: pure spin current generation in mesoscopic conductors with non-uniform magnetic fields
- Coherent spin ratchets: A spin-orbit based quantum ratchet mechanism for spin-polarized currents in ballistic conductors
- Spin current and rectification in one-dimensional electronic systems
- Spin current and rectification in Luttinger liquids
- Zeeman ratchets for ballistic spin currents
- Interplay between quantum dissipation and an in-plane magnetic field in the spin ratchet effect
- Extrinsic and intrinsic ratchet response of a quantum dissipative spin-orbit medium