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Article: Spin-polarized parametric pumping: Theory and numerical results

TitleSpin-polarized parametric pumping: Theory and numerical results
Authors
KeywordsPhysics
Issue Date2002
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2002, v. 66 n. 20, p. 205327:1-9 How to Cite?
AbstractWe have extended the previous parametric electron pumping theory to include the spin-polarized pumping effect. Specifically, we consider a parametric pump consisting of a nonmagnetic system with two ferromagnetic leads whose magnetic moments orient at an angle θ with respect to each other. In our theory, the leads can be maintained at different chemical potentials. As a result, the current is driven due to both the external bias and the pumping potentials. When both θ and the external bias are zero, our theory recovers the known theory. In particular, two cases are considered: (i) in the adiabatic regime, we have derived the pumped current for an arbitrary pumping amplitude and external bias and (ii) at finite frequency, the system is away from equilibrium, and we have derived the pumped current up to quadratic order in pumping amplitude. From our numerical results we found that the pumped current can be modulated by the angle θ, showing interesting spin-valve effects.
Persistent Identifierhttp://hdl.handle.net/10722/43369
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Jen_HK
dc.contributor.authorWang, Ben_HK
dc.contributor.authorWang, Jen_HK
dc.date.accessioned2007-03-23T04:44:25Z-
dc.date.available2007-03-23T04:44:25Z-
dc.date.issued2002en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2002, v. 66 n. 20, p. 205327:1-9en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43369-
dc.description.abstractWe have extended the previous parametric electron pumping theory to include the spin-polarized pumping effect. Specifically, we consider a parametric pump consisting of a nonmagnetic system with two ferromagnetic leads whose magnetic moments orient at an angle θ with respect to each other. In our theory, the leads can be maintained at different chemical potentials. As a result, the current is driven due to both the external bias and the pumping potentials. When both θ and the external bias are zero, our theory recovers the known theory. In particular, two cases are considered: (i) in the adiabatic regime, we have derived the pumped current for an arbitrary pumping amplitude and external bias and (ii) at finite frequency, the system is away from equilibrium, and we have derived the pumped current up to quadratic order in pumping amplitude. From our numerical results we found that the pumped current can be modulated by the angle θ, showing interesting spin-valve effects.en_HK
dc.format.extent133925 bytes-
dc.format.extent25600 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysicsen_HK
dc.titleSpin-polarized parametric pumping: Theory and numerical resultsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=66&issue=20&spage=205327:1&epage=9&date=2002&atitle=Spin-polarized+parametric+pumping:+Theory+and+numerical+resultsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.66.205327en_HK
dc.identifier.scopuseid_2-s2.0-0037113407-
dc.identifier.hkuros75068-
dc.identifier.isiWOS:000179773900061-

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