6533b82cfe1ef96bd128ec41
RESEARCH PRODUCT
Single-parameter quantized charge pumping in high magnetic fields
Hans Werner SchumacherUwe SiegnerVyacheslavs KashcheyevsC. LeichtBernd KaestnerKlaus Pierzsubject
PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsPhysics and Astronomy (miscellaneous)Spin polarizationCondensed matter physicsFOS: Physical sciencesHeterojunction02 engineering and technologyElectron021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesMagnetic fieldCharge pumpingQuantization (physics)Quantum dot0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physics0210 nano-technologyVoltagedescription
We study single-parameter quantized charge pumping via a semiconductor quantum dot in high magnetic fields. The quantum dot is defined between two top gates in an AlGaAs/GaAs heterostructure. Application of an oscillating voltage to one of the gates leads to pumped current plateaus in the gate characteristic, corresponding to controlled transfer of integer multiples of electrons per cycle. In a perpendicular-to-plane magnetic field the plateaus become more pronounced indicating an improved current quantization. Current quantization is sustained up to magnetic fields where full spin polarization of the device can be expected.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-11-07 |